coverity: hnbgw_rua.c: remove redundant check

'map' is already guaranteed to be not NULL for that message type by the
preceding switch().

Related: CID#307434
Change-Id: Id30f459616391187aa2f8ad400c316e2144154c6

src/osmo-hnbgw/hnbgw_rua.c

@@ -253,8 +253,7 @@ int rua_to_scu(struct hnb_context *hnb,
 		prim->u.disconnect.cause = cause;
 		release_context_map = true;
 		/* Mark SCCP conn as gracefully disconnected */
-		if (map)
-			map->scu_conn_active = false;
+		map->scu_conn_active = false;
 		break;
 	case OSMO_SCU_PRIM_N_UNITDATA:
 		prim->u.unitdata.called_addr = *remote_addr;