media: uvcvideo: Set error_idx during ctrl_commit errors

[ Upstream commit 6350d6a4 ]

If we have an error setting a control, return the affected control in
the error_idx field.

Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Stable-dep-of: d9fecd09 ("media: uvcvideo: Only save async fh if success")
Signed-off-by: Sasha Levin <sashal@kernel.org>