version_set_test.cc: remove a redundent obj copy (#7880)

Summary:
Remove redundant obj copy

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7880

Reviewed By: akankshamahajan15

Differential Revision: D26921119

Pulled By: riversand963

fbshipit-source-id: f227da688b067870a069e728a67799a8a95fee99

db/version_set_test.cc

@@ -2793,11 +2793,9 @@ class VersionSetTestMissingFiles : public VersionSetTestBase,
       s = fs_->GetFileSize(fname, IOOptions(), &file_size, nullptr);
       ASSERT_OK(s);
       ASSERT_NE(0, file_size);
-      FileMetaData meta;
-      meta = FileMetaData(file_num, /*file_path_id=*/0, file_size, ikey, ikey,
-                          0, 0, false, 0, 0, 0, kUnknownFileChecksum,
+      file_metas->emplace_back(file_num, /*file_path_id=*/0, file_size, ikey,
+                               ikey, 0, 0, false, 0, 0, 0, kUnknownFileChecksum,
                                kUnknownFileChecksumFuncName);
-      file_metas->emplace_back(meta);
     }
   }