Merge branch 'tobij/fix-image-xwd-decoding' into 8.0

* tobij/fix-image-xwd-decoding:
  Image.XWD: Improve size checks to better detect malformed images
  Image.XWD: Remove $Id$

src/modules/Image/encodings/xwd.c

@@ -302,7 +302,7 @@ void img_xwd__decode(INT32 args,int header_only,int skipcmap)
       n++;
       push_text("image");
 
-      if (s->len-(int)(header.header_size+header.ncolors*12)<0)
+      if (s->len-(unsigned int)(header.header_size+header.ncolors*12)<0)
 	 push_empty_string();
       else
 	 push_string(make_shared_binary_string(