[media] cadet: use unlocked_ioctl
Converted from ioctl to unlocked_ioctl. This driver already used an internal lock, but it was missing in cadet_open and cadet_release and it was not used correctly in cadet_read. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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