nullify loading_rio on startup

Signed-off-by: naglera <[email protected]>

src/server.c

@@ -2177,6 +2177,7 @@ void initServerConfig(void) {
     server.fsynced_reploff_pending = 0;
     server.rdb_client_id = -1;
     server.loading_process_events_interval_ms = LOADING_PROCESS_EVENTS_INTERVAL_DEFAULT;
+    server.loading_rio = NULL;
 
     /* Replication partial resync backlog */
     server.repl_backlog = NULL;