fix BSC Clear Request

On receiving a Clear Request, don't send a Clear Command "out of band", let the
FSM do the release handling by invoking msc_subscr_conn_mo_close().

Fixes: ttcn3 MSC_Tests.TC_lu_clear_request
Change-Id: I168b889ac7989641cc679b781dcffb87ff13a710
diff --git a/src/libmsc/a_iface_bssap.c b/src/libmsc/a_iface_bssap.c
index 87ccf05..6d5848a 100644
--- a/src/libmsc/a_iface_bssap.c
+++ b/src/libmsc/a_iface_bssap.c
@@ -216,8 +216,6 @@
 static int bssmap_rx_clear_rqst(struct gsm_subscriber_connection *conn,
 				struct msgb *msg, struct tlv_parsed *tp)
 {
-	int rc;
-	struct msgb *msg_resp;
 	uint8_t cause;
 
 	LOGPCONN(conn, LOGL_INFO, "Rx BSSMAP CLEAR REQUEST\n");
@@ -228,13 +226,9 @@
 	}
 	cause = TLVP_VAL(tp, GSM0808_IE_CAUSE)[0];
 
-	/* Respond with clear command */
-	msg_resp = gsm0808_create_clear_command(GSM0808_CAUSE_CALL_CONTROL);
-	rc = osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg_resp);
+	msc_subscr_conn_mo_close(conn, cause);
 
-	msc_clear_request(conn, cause);
-
-	return rc;
+	return 0;
 }
 
 /* Endpoint to handle BSSMAP clear complete */