All the callers were already checking for failure, except that
createSourcePicture() itself was failing to check whether it
successfully allocated the Picture.
[ajax: Rebase, fix line wrap of preceding line]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
(cherry picked from commit 211d4c2d35)