In pixman_image_set_transform() allow NULL for transform

Previously, this would crash unless the existing transform were also
NULL.

diff --git a/pixman/pixman-image.c b/pixman/pixman-image.c
index 55fc17a..9103ca6 100644 (file)
--- a/pixman/pixman-image.c
+++ b/pixman/pixman-image.c
@@ -502,7 +502,7 @@ pixman_image_set_transform (pixman_image_t *          image,
     if (common->transform == transform)
        return TRUE;
 
-    if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
+    if (!transform || memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
     {
        free (common->transform);
        common->transform = NULL;