remove move from substr

src/node_file.cc

@@ -2150,7 +2150,7 @@ static void ReaddirRecursiveSync(const FunctionCallbackInfo<Value>& args) {
           }
 #endif
           if (start_pos < full_path_length) {
-            relative_paths.emplace_back(std::move(full_path.substr(start_pos)));
+            relative_paths.emplace_back(full_path.substr(start_pos));
           }
         }
       }