'usecount' was removed in revision 6926 but parts were accidentally merged back in revision 8123 as part of the Hx8 merge. Signed-off-by: Shaun Ruffell <sruffell@digium.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9470 a0bf4364-ded3-4de4-8d8a-66a801d63aff