This patch will fix usage counting of logical channel. Also it adds usage counter debugging.

The use counter is increased on loaction update request. The counter is not decreased when location update responds (mm_rx_id_resp()), but if subscriber is authorized, it will be decreased on release_loc_update_req(). If lchan closes, the location update is also released (release_loc_update_req()), also if the location update times out.

In case of a channel connection failure with cause 0x18, the logical channel is not released if usage counter of lchan is not 0.