[rsl] Set the release state from within the lchan class

Currently our GSM04.11 code is closing the link for SAPI=3
and this would mean that the whole channel would be scheduled
for close... where we only want to close everything when freeing
the lchan or handling an error.

openbsc/src/abis_rsl.c

@@ -727,7 +727,6 @@ int rsl_release_request(struct gsm_lchan *lchan, u_int8_t link_id)
 			     link_id, 0);
 	msgb_tv_put(msg, RSL_IE_RELEASE_MODE, 0);	/* normal release */
 
-	rsl_lchan_set_state(lchan, LCHAN_S_REL_REQ);
 	/* FIXME: start some timer in case we don't receive a REL ACK ? */
 
 	msg->trx = lchan->ts->trx;

openbsc/src/chan_alloc.c

@@ -348,6 +348,7 @@ int lchan_auto_release(struct gsm_lchan *lchan)
 			lchan->conn.use_count);
 
 	DEBUGP(DRLL, "%s Recycling Channel\n", gsm_lchan_name(lchan));
+	rsl_lchan_set_state(lchan, LCHAN_S_REL_REQ);
 	rsl_release_request(lchan, 0);
 	return 1;
 }