[dia] [scan-build] Dereference of null pointer

[Hans Breuer <hans src gnome org>]

commit aa234606168e97e944504ff5261a9d1cef9d77b7
Author: Hans Breuer <hans breuer org>
Date:   Fri Oct 4 16:35:01 2013 +0200

    [scan-build] Dereference of null pointer
    
    dia_image.c:413:32: warning: Access to field 'image' results in a
    dereference of a null pointer (loaded from variable 'image')
      if (gdk_pixbuf_get_has_alpha(image->image)) {

 lib/dia_image.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/lib/dia_image.c b/lib/dia_image.c
index 681ed2e..6bbb9a4 100644
--- a/lib/dia_image.c
+++ b/lib/dia_image.c
@@ -410,6 +410,7 @@ dia_image_rgb_data(const DiaImage *image)
   if (!rgb_pixels)
     return NULL;
 
+  g_return_val_if_fail (image != NULL, NULL);
   if (gdk_pixbuf_get_has_alpha(image->image)) {
     guint8 *pixels = gdk_pixbuf_get_pixels(image->image);
     int i, j;