[media] omap3isp: queue: Fix omap3isp_video_queue_dqbuf() description comment

Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>