Optimize inferface performance needed when running

ge/hybrid/model/hybrid_model_builder.cc

@@ -1533,7 +1533,7 @@ Status HybridModelBuilder::RecoverGraphUnknownFlag() {
     }
   }
   // for performance
-  for (auto &subgraph : root_graph->GetAllSubgraphs()) {
+  for (auto &sub_graph : root_graph->GetAllSubgraphs()) {
     GE_CHECK_NOTNULL(sub_graph);
     for (const auto &node : sub_graph->GetDirectNode()) {
       auto op_desc = node->GetOpDesc();