Don't run the pre- and post-unregister hooks on a non-phone XPD (practically: the echo canceller). This fixes a panic with manual 'dahdi_registertion off' as it is now called for the whole device (regression of 2.6.x). Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com> Origin: http://svnview.digium.com/svn/dahdi?view=rev&rev=10735 git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/branches/2.6@10736 a0bf4364-ded3-4de4-8d8a-66a801d63aff