Eliminate the assumption that the check function is going to be called
for every frame. Also use a state machine to make polarity debouncing
similar to the other debouncing code.
Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Russ Meyerriecks <rmeyerriecks@digium.com>
git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10170 a0bf4364-ded3-4de4-8d8a-66a801d63aff