[media] v4l2-ioctl: add ctrl_handler to v4l2_fh
This is required to implement control events and is also needed to allow for per-filehandle control handlers. Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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