修复开启备机归档时内存泄漏的bug

src/gausskernel/storage/replication/walreceiver.cpp

@@ -3031,6 +3031,8 @@ static void InitArchiveStartPoint()
         pfree(xlog_array);
         xlog_array = NULL;
     }
+    FreeDir(xldir);
+    xldir = NULL;
 }
 
 static bool CheckXlogNameValid(char* xlog)

src/gausskernel/storage/replication/walsender.cpp

@@ -3203,7 +3203,9 @@ static int WalSndLoop(WalSndSendDataCallback send_data)
             XLogRecPtr replayPtr;
             bool amSync = false;
             bool got_recptr = false;
-            int standby_nums = list_length(SyncRepGetSyncStandbys(&amSync));
+            List* sync_standbys = SyncRepGetSyncStandbys(&amSync);
+            int standby_nums = list_length(sync_standbys);
+            list_free(sync_standbys);
             got_recptr = SyncRepGetSyncRecPtr(&receivePtr, &writePtr, &flushPtr, &replayPtr, &amSync, false);
             if (got_recptr) {
                 ArchiveXlogOnStandby(flushPtr);