[media] uvcvideo: Lock stream mutex when accessing format-related information
The stream mutex protects access to the struct uvc_streaming ctrl, cur_format and cur_frame fields as well as to the hardware probe control. Lock it appropriately. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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