We have freed the channel there is no subscriber associated anymore

FIXME: Introduce refcounting on the subscriber record. This looks like
a genuine memory leak to me.

src/chan_alloc.c

@@ -185,6 +185,7 @@ struct gsm_lchan *lchan_alloc(struct gsm_bts *bts, enum gsm_chan_t type)
 void lchan_free(struct gsm_lchan *lchan)
 {
 	lchan->type = GSM_LCHAN_NONE;
+	lchan->subscr = 0;
 
 	/* stop the timer */
 	del_timer(&lchan->release_timer);