[media] v4l2-ctrl: fix error return of copy_to/from_user
copy_to/from_user returns the number of bytes not copied, it does not return a 'normal' linux error code. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
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