[media] uvcvideo: Disable the queue when failing to start

When failing to start the camera we should disable the queue again, to
rollback into the same initial state. Otherwise re-trying will always
hit -EBUSY

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>