Make "xfree (NULL)" a no-op; remove useless if-before-xfree.

* src/alloc.c (xfree): Return right away for a NULL arg.
* src/lread.c (nosuffix): Remove now-useless if-before-xfree tests.
* src/gtkutil.c (xg_gtk_scroll_destroy): Likewise.
* src/mac.c (create_apple_event_from_event_ref): Likewise.
(create_apple_event_from_drag_ref, cfstring_create_normalized): Likewise.
* src/doprnt.c (doprnt1): Likewise.
* src/frame.c (frame): Likewise.
* src/keyboard.c (wipe_kboard): Likewise.
* src/macterm.c (x_free_frame_resources, xlfdpat_destroy, XFreePixmap):
(init_font_name_table, mac_unload_font, x_delete_display): Likewise.
* src/term.c (tty_default_color_capabilities, maybe_fatal)
(delete_tty): Likewise.
* src/w16select.c (string): Likewise.
* src/w32.c (w32_get_resource, SET_ENV_BUF_SIZE): Likewise.
* src/w32bdf.c (w32_free_bdf_font): Likewise.
* src/w32fns.c (w32_unload_font): Likewise.
* src/w32font.c (w32font_close): Likewise.
* src/window.c (size_window): Likewise.
* src/xselect.c (receive_incremental_selection): Likewise.
* src/xterm.c (x_free_frame_resources, x_delete_display): Likewise.
* src/mactoolbox.c (create_apple_event_from_drag_ref): Likewise.
* src/w32.c (stat): Likewise.

18 files changed, 80 insertions, 93 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 5d071f0c764..d7db9c29588 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,13 +1,37 @@
 2008-06-02  Jim Meyering  <meyering@redhat.com>
 
+        Make "xfree (NULL)" a no-op; remove useless if-before-xfree.
+        * alloc.c (xfree): Return right away for a NULL arg.
+        * lread.c (nosuffix): Remove now-useless if-before-xfree tests.
+        * gtkutil.c (xg_gtk_scroll_destroy): Likewise.
+        * mac.c (create_apple_event_from_event_ref): Likewise.
+        (create_apple_event_from_drag_ref, cfstring_create_normalized): Likewise.
+        * doprnt.c (doprnt1): Likewise.
+        * frame.c (frame): Likewise.
+        * keyboard.c (wipe_kboard): Likewise.
+        * macterm.c (x_free_frame_resources, xlfdpat_destroy, XFreePixmap):
+        (init_font_name_table, mac_unload_font, x_delete_display): Likewise.
+        * term.c (tty_default_color_capabilities, maybe_fatal)
+        (delete_tty): Likewise.
+        * w16select.c (string): Likewise.
+        * w32.c (w32_get_resource, SET_ENV_BUF_SIZE): Likewise.
+        * w32bdf.c (w32_free_bdf_font): Likewise.
+        * w32fns.c (w32_unload_font): Likewise.
+        * w32font.c (w32font_close): Likewise.
+        * window.c (size_window): Likewise.
+        * xselect.c (receive_incremental_selection): Likewise.
+        * xterm.c (x_free_frame_resources, x_delete_display): Likewise.
+        * mactoolbox.c (create_apple_event_from_drag_ref): Likewise.
+        * w32.c (stat): Likewise.
+
         remove useless if-before-free tests
-        * src/editfns.c (Fset_time_zone_rule): Likewise.
-        * src/lread.c (nosuffix): Likewise.
-        * src/ralloc.c (get_bloc): Likewise.
-        * src/regex.c (reg_free): Likewise.
-        * src/xftfont.c (xftfont_open, xftfont_close): Likewise.
-        * src/xrdb.c (get_user_app, get_environ_db, x_load_resources): Likewise.
-        * src/xsmfns.c (smc_save_yourself_CB): Likewise.
+        * editfns.c (Fset_time_zone_rule): Likewise.
+        * lread.c (nosuffix): Likewise.
+        * ralloc.c (get_bloc): Likewise.
+        * regex.c (reg_free): Likewise.
+        * xftfont.c (xftfont_open, xftfont_close): Likewise.
+        * xrdb.c (get_user_app, get_environ_db, x_load_resources): Likewise.
+        * xsmfns.c (smc_save_yourself_CB): Likewise.
 
 2008-06-02  Kenichi Handa  <handa@m17n.org>
 
diff --git a/src/alloc.c b/src/alloc.c
index 031cb99b674..797b385fbd2 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -797,6 +797,8 @@ void
 xfree (block)
      POINTER_TYPE *block;
 {
+  if (!block)
+    return;
   MALLOC_BLOCK_INPUT;
   free (block);
   MALLOC_UNBLOCK_INPUT;
diff --git a/src/doprnt.c b/src/doprnt.c
index 05b194c9dbb..c7c27bac4c3 100644
--- a/src/doprnt.c
+++ b/src/doprnt.c
@@ -326,8 +326,7 @@ doprnt1 (lispstrings, buffer, bufsize, format, format_end, nargs, args)
     };
 
   /* If we had to malloc something, free it.  */
-  if (big_buffer)
-    xfree (big_buffer);
+  xfree (big_buffer);
 
   *bufptr = 0;          /* Make sure our string end with a '\0' */
   return bufptr - buffer;
diff --git a/src/frame.c b/src/frame.c
index 20812878c10..84a4e54d314 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -1477,20 +1477,13 @@ But FORCE inhibits this too.  */)
   Vframe_list = Fdelq (frame, Vframe_list);
   FRAME_SET_VISIBLE (f, 0);
 
-  if (f->namebuf)
-    xfree (f->namebuf);
-  if (f->decode_mode_spec_buffer)
-    xfree (f->decode_mode_spec_buffer);
-  if (FRAME_INSERT_COST (f))
-    xfree (FRAME_INSERT_COST (f));
-  if (FRAME_DELETEN_COST (f))
-    xfree (FRAME_DELETEN_COST (f));
-  if (FRAME_INSERTN_COST (f))
-    xfree (FRAME_INSERTN_COST (f));
-  if (FRAME_DELETE_COST (f))
-    xfree (FRAME_DELETE_COST (f));
-  if (FRAME_MESSAGE_BUF (f))
-    xfree (FRAME_MESSAGE_BUF (f));
+  xfree (f->namebuf);
+  xfree (f->decode_mode_spec_buffer);
+  xfree (FRAME_INSERT_COST (f));
+  xfree (FRAME_DELETEN_COST (f));
+  xfree (FRAME_INSERTN_COST (f));
+  xfree (FRAME_DELETE_COST (f));
+  xfree (FRAME_MESSAGE_BUF (f));
 
   /* Since some events are handled at the interrupt level, we may get
      an event for f at any time; if we zero out the frame's terminal
diff --git a/src/gtkutil.c b/src/gtkutil.c
index fd0fbf778b2..afafee11916 100644
--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -3106,7 +3106,7 @@ xg_gtk_scroll_destroy (widget, data)
   int id = (int) (EMACS_INT) data; /* The EMACS_INT cast avoids a warning. */
 
   p = g_object_get_data (G_OBJECT (widget), XG_LAST_SB_DATA);
-  if (p) xfree (p);
+  xfree (p);
   xg_remove_widget_from_map (id);
 }
 
diff --git a/src/keyboard.c b/src/keyboard.c
index 45f3d2f6194..5ac28a55247 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -11575,8 +11575,7 @@ static void
 wipe_kboard (kb)
      KBOARD *kb;
 {
-  if (kb->kbd_macro_buffer)
-    xfree (kb->kbd_macro_buffer);
+  xfree (kb->kbd_macro_buffer);
 }
 
 #ifdef MULTI_KBOARD
diff --git a/src/lread.c b/src/lread.c
index 578addf1329..e5e77bc3477 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -1273,8 +1273,7 @@ Return t if the file exists and loads successfully.  */)
   saved_doc_string = 0;
   saved_doc_string_size = 0;
 
-  if (prev_saved_doc_string)
-    xfree (prev_saved_doc_string);
+  xfree (prev_saved_doc_string);
   prev_saved_doc_string = 0;
   prev_saved_doc_string_size = 0;
 
diff --git a/src/mac.c b/src/mac.c
index e549524bc1f..20872b2bdc9 100644
--- a/src/mac.c
+++ b/src/mac.c
@@ -906,8 +906,7 @@ mac_event_parameters_to_lisp (event, num_params, names, types)
           break;
         }
     }
-  if (buf)
-    xfree (buf);
+  xfree (buf);
 
   return result;
 }
@@ -4778,10 +4777,8 @@ cfstring_create_normalized (str, symbol)
                                                out_len / sizeof (UniChar));
       if (uni)
         DisposeUnicodeToTextInfo (&uni);
-      if (out_buf)
-        xfree (out_buf);
-      if (buffer)
-        xfree (buffer);
+      xfree (out_buf);
+      xfree (buffer);
     }
   else
     {
diff --git a/src/macterm.c b/src/macterm.c
index ae9aa1108d2..2871bfa1179 100644
--- a/src/macterm.c
+++ b/src/macterm.c
@@ -910,8 +910,7 @@ XFreePixmap (display, pixmap)
 #if USE_MAC_IMAGE_IO
   if (pixmap)
     {
-      if (pixmap->data)
-        xfree (pixmap->data);
+      xfree (pixmap->data);
       xfree (pixmap);
     }
 #else
@@ -7390,8 +7389,7 @@ x_free_frame_resources (f)
 
   x_free_gcs (f);
 
-  if (FRAME_SIZE_HINTS (f))
-    xfree (FRAME_SIZE_HINTS (f));
+  xfree (FRAME_SIZE_HINTS (f));
 
   xfree (f->output_data.mac);
   f->output_data.mac = NULL;
@@ -7640,8 +7638,7 @@ xlfdpat_destroy (pat)
     {
       if (pat->buf)
         {
-          if (pat->blocks)
-            xfree (pat->blocks);
+          xfree (pat->blocks);
           xfree (pat->buf);
         }
       xfree (pat);
@@ -8364,8 +8361,7 @@ init_font_name_table ()
                                          HASH_VALUE (h, j));
             prev_family = family;
           }
-      if (font_ids)
-        xfree (font_ids);
+      xfree (font_ids);
     }
 #endif
 
@@ -9242,20 +9238,17 @@ mac_unload_font (dpyinfo, font)
       int i;
 
       for (i = font->min_byte1; i <= font->max_byte1; i++)
-        if (font->bounds.rows[i])
-          xfree (font->bounds.rows[i]);
+        xfree (font->bounds.rows[i]);
       xfree (font->bounds.rows);
       ATSUDisposeStyle (font->mac_style);
     }
   else
 #endif
-    if (font->bounds.per_char)
-      xfree (font->bounds.per_char);
+    xfree (font->bounds.per_char);
 #if USE_CG_TEXT_DRAWING
   if (font->cg_font)
     CGFontRelease (font->cg_font);
-  if (font->cg_glyphs)
-    xfree (font->cg_glyphs);
+  xfree (font->cg_glyphs);
 #endif
   xfree (font);
 }
@@ -13026,12 +13019,10 @@ x_delete_display (dpyinfo)
 
   if (dpyinfo->font_table)
     {
-      if (dpyinfo->font_table->font_encoder)
-        xfree (dpyinfo->font_table->font_encoder);
+      xfree (dpyinfo->font_table->font_encoder);
       xfree (dpyinfo->font_table);
     }
-  if (dpyinfo->mac_id_name)
-    xfree (dpyinfo->mac_id_name);
+  xfree (dpyinfo->mac_id_name);
 
   if (x_display_list == 0)
     {
diff --git a/src/mactoolbox.c b/src/mactoolbox.c
index b5e87a3c672..a73578d5205 100644
--- a/src/mactoolbox.c
+++ b/src/mactoolbox.c
@@ -6091,8 +6091,7 @@ create_apple_event_from_drag_ref (drag, num_types, types, result)
       if (err != noErr)
         break;
     }
-  if (buf)
-    xfree (buf);
+  xfree (buf);
 
   if (err == noErr)
     {
diff --git a/src/term.c b/src/term.c
index 7636f22db75..533104dc040 100644
--- a/src/term.c
+++ b/src/term.c
@@ -2090,17 +2090,14 @@ tty_default_color_capabilities (struct tty_display_info *tty, int save)
 
   if (save)
     {
-      if (default_orig_pair)
-        xfree (default_orig_pair);
+      xfree (default_orig_pair);
       default_orig_pair = tty->TS_orig_pair ? xstrdup (tty->TS_orig_pair) : NULL;
 
-      if (default_set_foreground)
-        xfree (default_set_foreground);
+      xfree (default_set_foreground);
       default_set_foreground = tty->TS_set_foreground ? xstrdup (tty->TS_set_foreground)
                                : NULL;
 
-      if (default_set_background)
-        xfree (default_set_background);
+      xfree (default_set_background);
       default_set_background = tty->TS_set_background ? xstrdup (tty->TS_set_background)
                                : NULL;
 
@@ -3833,8 +3830,7 @@ maybe_fatal (must_succeed, buffer, terminal, str1, str2, arg1, arg2)
      struct terminal *terminal;
      char *str1, *str2, *arg1, *arg2;
 {
-  if (buffer)
-    xfree (buffer);
+  xfree (buffer);
 
   if (terminal)
     delete_tty (terminal);
@@ -3915,11 +3911,8 @@ delete_tty (struct terminal *terminal)
 
   delete_terminal (terminal);
 
-  if (tty->name)
-    xfree (tty->name);
-
-  if (tty->type)
-    xfree (tty->type);
+  xfree (tty->name);
+  xfree (tty->type);
 
   if (tty->input)
     {
@@ -3932,11 +3925,8 @@ delete_tty (struct terminal *terminal)
   if (tty->termscript)
     fclose (tty->termscript);
 
-  if (tty->old_tty)
-    xfree (tty->old_tty);
-
-  if (tty->Wcm)
-    xfree (tty->Wcm);
+  xfree (tty->old_tty);
+  xfree (tty->Wcm);
 
   bzero (tty, sizeof (struct tty_display_info));
   xfree (tty);
diff --git a/src/w16select.c b/src/w16select.c
index 24e92b24dfb..177a84f5e3b 100644
--- a/src/w16select.c
+++ b/src/w16select.c
@@ -565,8 +565,7 @@ DEFUN ("w16-set-clipboard-data", Fw16_set_clipboard_data, Sw16_set_clipboard_dat
   ok = 0;
 
  unblock:
-  if (dst)
-    xfree (dst);
+  xfree (dst);
   UNBLOCK_INPUT;
 
   /* Notify user if the text is too large to fit into DOS memory.
diff --git a/src/w32.c b/src/w32.c
index 36635a433f5..81accb6b610 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -1128,7 +1128,7 @@ w32_get_resource (key, lpdwtype)
           return (lpvalue);
         }
 
-      if (lpvalue) xfree (lpvalue);
+      xfree (lpvalue);
 
       RegCloseKey (hrootkey);
     }
@@ -1145,7 +1145,7 @@ w32_get_resource (key, lpdwtype)
           return (lpvalue);
         }
 
-      if (lpvalue) xfree (lpvalue);
+      xfree (lpvalue);
 
       RegCloseKey (hrootkey);
     }
@@ -1346,7 +1346,7 @@ init_environment (char ** argv)
                 /* Also ignore empty environment variables.  */
                 || *lpval == 0)
               {
-                if (lpval) xfree (lpval);
+                xfree (lpval);
                 lpval = env_vars[i].def_value;
                 dwType = REG_EXPAND_SZ;
                 dont_free = 1;
@@ -2962,8 +2962,7 @@ stat (const char * path, struct stat * buf)
 
       get_file_owner_and_group (NULL, name, buf);
     }
-  if (psd)
-    xfree (psd);
+  xfree (psd);
 
 #if 0
   /* Not sure if there is any point in this.  */
diff --git a/src/w32bdf.c b/src/w32bdf.c
index e7fbe51b146..e9a1e63569e 100644
--- a/src/w32bdf.c
+++ b/src/w32bdf.c
@@ -304,10 +304,10 @@ w32_free_bdf_font(bdffont *fontp)
   CloseHandle(fontp->hfilemap);
   CloseHandle(fontp->hfile);
 
-  if (fontp->registry) xfree(fontp->registry);
-  if (fontp->encoding) xfree(fontp->encoding);
-  if (fontp->slant) xfree(fontp->slant);
-/*  if (fontp->width) xfree(fontp->width); */
+  xfree(fontp->registry);
+  xfree(fontp->encoding);
+  xfree(fontp->slant);
+/*  xfree(fontp->width); */
 
   xfree(fontp->filename);
   for(i = 0;i < BDF_FIRST_OFFSET_TABLE;i++)
diff --git a/src/w32fns.c b/src/w32fns.c
index b18a1233b8a..e83acf0711d 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -4955,7 +4955,7 @@ w32_unload_font (dpyinfo, font)
 {
   if (font)
     {
-      if (font->per_char) xfree (font->per_char);
+      xfree (font->per_char);
       if (font->bdf) w32_free_bdf_font (font->bdf);
 
       if (font->hfont) DeleteObject (font->hfont);
diff --git a/src/window.c b/src/window.c
index c5e8b56084b..295e45b25a8 100644
--- a/src/window.c
+++ b/src/window.c
@@ -3195,7 +3195,7 @@ size_window (window, size, width_p, nodelete_p, first_only, last_only)
           last_pos += new_size;
         }
 
-      if (new_sizes) xfree (new_sizes);
+      xfree (new_sizes);
 
       /* We should have covered the parent exactly with child windows.  */
       xassert (size == last_pos - first_pos);
diff --git a/src/xselect.c b/src/xselect.c
index dd5c1dcc6ba..11ee5945a79 100644
--- a/src/xselect.c
+++ b/src/xselect.c
@@ -1673,7 +1673,7 @@ receive_incremental_selection (display, window, property, target_type,
             XSelectInput (display, window, STANDARD_EVENT_SET);
           /* Use xfree, not XFree, because x_get_window_property
              calls xmalloc itself.  */
-          if (tmp_data) xfree (tmp_data);
+          xfree (tmp_data);
           break;
         }
 
diff --git a/src/xterm.c b/src/xterm.c
index a14a8ed20eb..fa7ffe5139e 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -9513,9 +9513,7 @@ x_free_frame_resources (f)
       XFlush (FRAME_X_DISPLAY (f));
     }
 
-  if (f->output_data.x->saved_menu_event)
-    xfree (f->output_data.x->saved_menu_event);
-
+  xfree (f->output_data.x->saved_menu_event);
   xfree (f->output_data.x);
   f->output_data.x = NULL;
 
@@ -10522,10 +10520,8 @@ x_delete_display (dpyinfo)
     xim_close_dpy (dpyinfo);
 #endif
 
-  if (dpyinfo->x_id_name)
-    xfree (dpyinfo->x_id_name);
-  if (dpyinfo->color_cells)
-    xfree (dpyinfo->color_cells);
+  xfree (dpyinfo->x_id_name);
+  xfree (dpyinfo->color_cells);
   xfree (dpyinfo);
 }