[media] uvcvideo: Refactor uvc_ctrl_get and query
This is a preparation patch for adding ctrl event support. Signed-off-by: NHans de Goede <hdegoede@redhat.com> Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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