Recylce a gsm_lchan when the refcount drops to zero

When a channel is allocated, start a timeout, when a lchan_use
is used the timer will be restarted, when the timeout fires
we will try to recycle or restart the timer.
tree: 69a6060c83a63decd910172a66e3f85f96c5b0a0
  1. tests/
  2. tools/
  3. AUTHORS
  4. configure.in
  5. COPYING
  6. Makefile.am
  7. README