routing: fixed code issues in routing.

modules/routing/core/result_generator.cc

@@ -399,7 +399,6 @@ bool ResultGenerator::GeneratePassageRegion(
   } else {
     GetNodesOfWaysBasedOnVirtual(nodes, &nodes_of_ways);
   }
-  std::vector<std::string> road_id_of_ways;
   for (const auto& way : nodes_of_ways) {
     std::vector<std::vector<NodeWithRange>> nodes_of_passages;
     if (way.empty()) {

modules/routing/topo_creator/graph_creator.cc

@@ -160,14 +160,13 @@ std::string GraphCreator::GetEdgeID(const std::string& from_id,
 void GraphCreator::AddEdge(const Node& from_node,
                            const RepeatedPtrField<Id>& to_node_vec,
                            const Edge::DirectionType& type) {
-  std::string edge_id = "";
   for (const auto& to_id : to_node_vec) {
     if (forbidden_lane_id_set_.find(to_id.id()) !=
         forbidden_lane_id_set_.end()) {
       ADEBUG << "Ignored lane [id = " << to_id.id();
       continue;
     }
-    edge_id = GetEdgeID(from_node.lane_id(), to_id.id());
+    const std::string edge_id = GetEdgeID(from_node.lane_id(), to_id.id());
     if (showed_edge_id_set_.count(edge_id) != 0) {
       continue;
     }