Port to platforms where NULL is a pointer

* src/image.c (x_create_x_image_and_pixmap):
The Picture type is an integer, not a pointer.
Come to think of it, Picture is really XID, and as
far as I can tell, all-bits-one is the invalid XID,
not all-bits-zero.  However that is a bigger issue;
for now, this patch just unbreaks the build.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/image.c b/src/image.c
index e4b097588ad..bcc61dfccda 100644
--- a/src/image.c
+++ b/src/image.c
@@ -2200,7 +2200,7 @@ x_create_x_image_and_pixmap (struct frame *f, int width, int height, int depth,
       else
         {
           image_error ("Specified image bit depth is not supported by XRender");
-          *picture = NULL;
+          *picture = 0;
         }
     }
 # endif