Fix minor problems found by static checking.

* frame.c (delete_frame):
* xdisp.c (next_element_from_display_vector):
Avoid uninitialized local.
* image.c (imagemagick_compute_animated_image): Port to C89.
Prefer usual GNU indentation style for loops.
Be more careful about bizarrely large sizes, by using ptrdiff_t
instead of int.

4 files changed, 59 insertions, 44 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index b17dec01e2c..46591eb1952 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,14 @@
+2013-08-15  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Fix minor problems found by static checking.
+        * frame.c (delete_frame):
+        * xdisp.c (next_element_from_display_vector):
+        Avoid uninitialized local.
+        * image.c (imagemagick_compute_animated_image): Port to C89.
+        Prefer usual GNU indentation style for loops.
+        Be more careful about bizarrely large sizes, by using ptrdiff_t
+        instead of int.
+
 2013-08-15  Dmitry Antipov  <dmantipov@yandex.ru>
 
         Fix infinite frame selection loop (Bug#15025).
diff --git a/src/frame.c b/src/frame.c
index 957f08b06c5..5ee001f4d98 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -1197,7 +1197,8 @@ delete_frame (Lisp_Object frame, Lisp_Object force)
   /* Don't let the frame remain selected.  */
   if (f == sf)
     {
-      Lisp_Object tail, frame1;
+      Lisp_Object tail;
+      Lisp_Object frame1 = Qnil;
 
       /* Look for another visible frame on the same terminal.
          Do not call next_frame here because it may loop forever.
diff --git a/src/image.c b/src/image.c
index 21b6f8979ee..3cab72edf74 100644
--- a/src/image.c
+++ b/src/image.c
@@ -7877,6 +7877,7 @@ static int animation_index = 0;
 static MagickWand *
 imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
 {
+  int i;
   MagickWand *composite_wand;
 
   MagickSetIteratorIndex (super_wand, 0);
@@ -7886,56 +7887,59 @@ imagemagick_compute_animated_image (MagickWand *super_wand, int ino)
   else
     composite_wand = animation_cache;
 
-  for (int i = max (1, animation_index); i <= ino; i++) {
-    MagickWand *sub_wand;
-    PixelIterator *source_iterator, *dest_iterator;
-    PixelWand **source, **dest;
-    size_t source_width, dest_width;
-    MagickPixelPacket pixel;
+  for (i = max (1, animation_index); i <= ino; i++)
+    {
+      MagickWand *sub_wand;
+      PixelIterator *source_iterator, *dest_iterator;
+      PixelWand **source, **dest;
+      size_t source_width, dest_width;
+      MagickPixelPacket pixel;
 
-    MagickSetIteratorIndex (super_wand, i);
-    sub_wand = MagickGetImage (super_wand);
+      MagickSetIteratorIndex (super_wand, i);
+      sub_wand = MagickGetImage (super_wand);
 
-    source_iterator = NewPixelIterator (sub_wand);
-    if (! source_iterator)
-      {
-        DestroyMagickWand (composite_wand);
-        DestroyMagickWand (sub_wand);
-        image_error ("Imagemagick pixel iterator creation failed",
-                     Qnil, Qnil);
-        return NULL;
-      }
+      source_iterator = NewPixelIterator (sub_wand);
+      if (! source_iterator)
+        {
+          DestroyMagickWand (composite_wand);
+          DestroyMagickWand (sub_wand);
+          image_error ("Imagemagick pixel iterator creation failed",
+                       Qnil, Qnil);
+          return NULL;
+        }
 
-    dest_iterator = NewPixelIterator (composite_wand);
-    if (! dest_iterator)
-      {
-        DestroyMagickWand (composite_wand);
-        DestroyMagickWand (sub_wand);
-        DestroyPixelIterator (source_iterator);
-        image_error ("Imagemagick pixel iterator creation failed",
-                     Qnil, Qnil);
-        return NULL;
-      }
+      dest_iterator = NewPixelIterator (composite_wand);
+      if (! dest_iterator)
+        {
+          DestroyMagickWand (composite_wand);
+          DestroyMagickWand (sub_wand);
+          DestroyPixelIterator (source_iterator);
+          image_error ("Imagemagick pixel iterator creation failed",
+                       Qnil, Qnil);
+          return NULL;
+        }
 
-    while ((source = PixelGetNextIteratorRow (source_iterator, &source_width))
-           != NULL) {
-      dest = PixelGetNextIteratorRow (dest_iterator, &dest_width);
-      for (int x = 0; x < source_width; x++)
+      while ((source = PixelGetNextIteratorRow (source_iterator, &source_width))
+             != NULL)
         {
-          /* Copy over non-transparent pixels. */
-          if (PixelGetAlpha (source[x]))
+          ptrdiff_t x;
+          dest = PixelGetNextIteratorRow (dest_iterator, &dest_width);
+          for (x = 0; x < source_width; x++)
             {
-              PixelGetMagickColor (source[x], &pixel);
-              PixelSetMagickColor (dest[x], &pixel);
+              /* Copy over non-transparent pixels. */
+              if (PixelGetAlpha (source[x]))
+                {
+                  PixelGetMagickColor (source[x], &pixel);
+                  PixelSetMagickColor (dest[x], &pixel);
+                }
             }
+          PixelSyncIterator(dest_iterator);
         }
-      PixelSyncIterator(dest_iterator);
-    }
 
-    DestroyPixelIterator (source_iterator);
-    DestroyPixelIterator (dest_iterator);
-    DestroyMagickWand (sub_wand);
-  }
+      DestroyPixelIterator (source_iterator);
+      DestroyPixelIterator (dest_iterator);
+      DestroyMagickWand (sub_wand);
+    }
 
   /* Cache a copy for the next iteration.  The current wand will be
      destroyed by the caller. */
diff --git a/src/xdisp.c b/src/xdisp.c
index 25a2ed23a97..ea1cd7dd2bc 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -7507,6 +7507,7 @@ next_element_from_display_vector (struct it *it)
       /* For the last character of the box-face run, we need to look
          either at the next glyph from the display vector, or at the
          face we saw before the display vector.  */
+      next_face_id = it->saved_face_id;
       if (it->current.dpvec_index < it->dpend - it->dpvec - 1)
         {
           if (it->dpvec_face_id >= 0)
@@ -7521,8 +7522,6 @@ next_element_from_display_vector (struct it *it)
                                             it->saved_face_id);
             }
         }
-      else
-        next_face_id = it->saved_face_id;
       next_face = FACE_FROM_ID (it->f, next_face_id);
       it->end_of_box_run_p = (this_face && this_face->box != FACE_NO_BOX
                               && (!next_face