This ioctl is called either via the "/dev/dahdi/channel" file or via a
/dev/dahdi/channo file. In either case, either the minor number of the
device file will match up with a channel, or the "private_data" member
on the channel will be set, so the unit is redundant.
Review: https://reviewboard.asterisk.org/r/905/
Signed-off-by: Shaun Ruffell <sruffell@digium.com>
git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9369 a0bf4364-ded3-4de4-8d8a-66a801d63aff