fix(autoware_behavior_velocity_planner): fix passedByValue (autowaref…

…oundation#8213)

fix:passedByValue

Signed-off-by: kobayu858 <yutaro.kobayashi@tier4.jp>

planning/behavior_velocity_planner/autoware_behavior_velocity_planner/src/planner_manager.cpp

@@ -35,7 +35,7 @@ std::string jsonDumpsPose(const geometry_msgs::msg::Pose & pose)
 }
 
 diagnostic_msgs::msg::DiagnosticStatus makeStopReasonDiag(
-  const std::string stop_reason, const geometry_msgs::msg::Pose & stop_pose)
+  const std::string & stop_reason, const geometry_msgs::msg::Pose & stop_pose)
 {
   diagnostic_msgs::msg::DiagnosticStatus stop_reason_diag;
   diagnostic_msgs::msg::KeyValue stop_reason_diag_kv;