V4L/DVB (6811): media-video-usbvision-add-mutex_unlock-to-error-paths-fix

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thierry MERLE <thierry.merle@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>