!2495 修改问题：更改表空间目录权限为000后，删除表空间虽然提示权限受限，但实际删除 成功

Merge pull request !2495 from zhaobingyu/master

src/gausskernel/optimizer/commands/tablespace.cpp

@@ -1553,7 +1553,7 @@ static bool destroy_tablespace_directories(Oid tablespaceoid, bool redo)
      */
     dirdesc = AllocateDir(linkloc_with_version_dir);
     if (dirdesc == NULL) {
-        if (!FILE_POSSIBLY_DELETED(errno)) {
+        if (FILE_POSSIBLY_DELETED(errno)) {
             if (!redo)
                 ereport(WARNING,
                     (errcode_for_file_access(),