simple-dmabuf-v4l: Remove incorrect assert

According to v4l2 documentation, DQBUF always clears FLAG_DONE, so
this assert can be expected to fire 100% of the time.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
1 file changed