[media] uvcvideo: Set error_idx properly for extended controls API failures
When one of the requested controls doesn't exist the error_idx field must reflect that situation. For G_EXT_CTRLS and S_EXT_CTRLS, error_idx must be set to the control count. For TRY_EXT_CTRLS, it must be set to the index of the unexisting control. This issue was found by the v4l2-compliance tool. Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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