Delete last variable from stop()

ros2_control_bolt/src/system_bolt.cpp

@@ -536,11 +536,8 @@ return_type SystemBoltHardware::stop()
   // Put torques to 0.0
   Eigen::Vector6d torques;
 
-  std::chrono::time_point<std::chrono::system_clock> last = std::chrono::system_clock::now();
-
   while (!robot_->IsTimeout()) {
         
-    last = std::chrono::system_clock::now();  // last+dt would be better
        
     for (const hardware_interface::ComponentInfo & joint : info_.joints) {
       torques[joint_name_to_motor_nb_[joint.name]] = 0.0;