commit 211d4c2d353b5e379716484055a3f58235ea65f4
  Author: Chris Wilson <chris@chris-wilson.co.uk>
  Date:   Wed Dec 14 15:55:22 2011 +0000

    render: Propagate allocation failure from createSourcePicture()

    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>