Fix a connection leak at SIGINT. (#759)

Author: DimCitus

src/bin/pg_autoctl/service_monitor.c

@@ -295,6 +295,7 @@ monitor_service_run(Monitor *monitor)
 	}
 
 	pgsql_finish(&(monitor->pgsql));
+	pgsql_finish(&(monitor->notificationClient));
 
 	return true;
 }