[media] uvcvideo: Handle uvc_init_video() failure in uvc_video_enable()

Turn streaming off (by selecting alternate setting 0) and disable the
video buffers queue in the uvc_video_enable() error path.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>