[dia] [scan-build] Argument with 'nonnull' attribute passed null

[Hans Breuer <hans src gnome org>]

commit c360f0816a4d3f7b7ca5b074a08fff513e1e7d51
Author: Hans Breuer <hans breuer org>
Date:   Sun Sep 27 14:33:30 2009 +0200

    [scan-build] Argument with 'nonnull' attribute passed null
    
    Also protect strcmp() against image->file==NULL.

 objects/standard/image.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/objects/standard/image.c b/objects/standard/image.c
index 4508b22..1a4b47d 100644
--- a/objects/standard/image.c
+++ b/objects/standard/image.c
@@ -189,7 +189,7 @@ image_set_props(Image *image, GPtrArray *props)
     mtime = st.st_mtime;
 
   /* handle changing the image. */
-  if (strcmp(image->file, old_file) != 0 || image->mtime != mtime) {
+  if (image->file && (strcmp(image->file, old_file) != 0 || image->mtime != mtime)) {
     Element *elem = &image->element;
     DiaImage *img = NULL;