Cleanup xmalloc.

* admin/coccinelle/xzalloc.cocci: Semantic patch to convert
calls to xmalloc with following memset to xzalloc.
* src/lisp.h (xzalloc): New prototype.  Omit needless casts.
* src/alloc.c (xzalloc): New function.  Omit needless casts.
* src/charset.c: Omit needless casts.  Convert all calls to
malloc with following memset to xzalloc.
* src/dispnew.c: Likewise.
* src/fringe.c: Likewise.
* src/image.c: Likewise.
* src/sound.c: Likewise.
* src/term.c: Likewise.
* src/w32fns.c: Likewise.
* src/w32font.c: Likewise.
* src/w32term.c: Likewise.
* src/xfaces.c: Likewise.
* src/xfns.c: Likewise.
* src/xterm.c: Likewise.
* src/atimer.c: Omit needless casts.
* src/buffer.c: Likewise.
* src/callproc.c: Likewise.
* src/ccl.c: Likewise.
* src/coding.c: Likewise.
* src/composite.c: Likewise.
* src/doc.c: Likewise.
* src/doprnt.c: Likewise.
* src/editfns.c: Likewise.
* src/emacs.c: Likewise.
* src/eval.c: Likewise.
* src/filelock.c: Likewise.
* src/fns.c: Likewise.
* src/gtkutil.c: Likewise.
* src/keyboard.c: Likewise.
* src/lisp.h: Likewise.
* src/lread.c: Likewise.
* src/minibuf.c: Likewise.
* src/msdos.c: Likewise.
* src/print.c: Likewise.
* src/process.c: Likewise.
* src/region-cache.c: Likewise.
* src/search.c: Likewise.
* src/sysdep.c: Likewise.
* src/termcap.c: Likewise.
* src/terminal.c: Likewise.
* src/tparam.c: Likewise.
* src/w16select.c: Likewise.
* src/w32.c: Likewise.
* src/w32reg.c: Likewise.
* src/w32select.c: Likewise.
* src/w32uniscribe.c: Likewise.
* src/widget.c: Likewise.
* src/xdisp.c: Likewise.
* src/xmenu.c: Likewise.
* src/xrdb.c: Likewise.
* src/xselect.c: Likewise.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/editfns.c b/src/editfns.c
index 8812ed9e555..741a97f7113 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -2157,8 +2157,8 @@ set_time_zone_rule (const char *tzstring)
   for (from = environ; *from; from++)
     continue;
   envptrs = from - environ + 2;
-  newenv = to = (char **) xmalloc (envptrs * sizeof (char *)
-                                   + (tzstring ? strlen (tzstring) + 4 : 0));
+  newenv = to = xmalloc (envptrs * sizeof (char *)
+                         + (tzstring ? strlen (tzstring) + 4 : 0));
 
   /* Add TZSTRING to the end of environ, as a value for TZ.  */
   if (tzstring)
@@ -3477,7 +3477,7 @@ usage: (message-box FORMAT-STRING &rest ARGS)  */)
       /* Copy the data so that it won't move when we GC.  */
       if (! message_text)
         {
-          message_text = (char *)xmalloc (80);
+          message_text = xmalloc (80);
           message_length = 80;
         }
       if (SBYTES (val) > message_length)