usbvision_set_video_format: add comment that VO_MODE is also being set.
Signed-off-by: NDavid Warman <dwarman@davidwarman.net>
Signed-off-by: NThierry MERLE <thierry.merle@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>