inter-BSC HO: send failure msg directly

If inter-BSC HO failed, the conn is by definition not in an active state, and
hence it makes no sense to verify the gscon FSM state before sending. Directly
call osmo_bsc_sigtran_send().

Change-Id: Ic49c94462041800674fa961c4d19c0c045bfe0c0

src/osmo-bsc/osmo_bsc_bssap.c

@@ -1121,7 +1121,7 @@ void bsc_tx_bssmap_ho_failure(struct gsm_subscriber_connection *conn)
 		return;
 	}
 
-	rc = gscon_sigtran_send(conn, msg);
+	rc = osmo_bsc_sigtran_send(conn, msg);
 	if (rc)
 		LOG_HO(conn, LOGL_ERROR, "Cannot send BSSMAP Handover Failure message (rc=%d %s)\n",
 		       rc, strerror(-rc));