V4L/DVB: video_ioctl2: don't return, use break

You want to be able to reach the debug code at the end of this function,
so don't use return, use break.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>