!3953 解决”关闭ustore引擎后，普通表分配xid仍然走到AllocateZonesBeforXid()逻辑“的问题

Merge pull request !3953 from jiangzhaoheng/disable_ustore_without_allocate_undozone

src/gausskernel/storage/access/ustore/undo/knl_uundoapi.cpp

@@ -655,6 +655,9 @@ void RecoveryUndoSystemMeta(void)
 void AllocateUndoZone()
 {
 #ifndef ENABLE_MULTIPLE_NODES
+    if (!g_instance.attr.attr_storage.enable_ustore) {
+        return;
+    }
     AllocateZonesBeforXid();
 #endif
 }