fixed on_set_chained_mode implementations to avoid cpplint warnings

Author: bhagyeshagresar

diff_drive_controller/src/diff_drive_controller.cpp

@@ -689,8 +689,9 @@ controller_interface::CallbackReturn DiffDriveController::configure_side(
 
 bool DiffDriveController::on_set_chained_mode(bool chained_mode)
 {
-  // Always accept switch to/from chained mode (without linting type-cast error)
-  return true || chained_mode;
+  // Fix to adhere to CppLint standards
+  (void)chained_mode
+  return true;
 }
 
 std::vector<hardware_interface::CommandInterface>

mecanum_drive_controller/src/mecanum_drive_controller.cpp

@@ -293,8 +293,9 @@ MecanumDriveController::on_export_reference_interfaces()
 
 bool MecanumDriveController::on_set_chained_mode(bool chained_mode)
 {
-  // Always accept switch to/from chained mode
-  return true || chained_mode;
+  // Fix to adhere to CppLint standards
+  (void)chained_mode
+  return true;
 }
 
 controller_interface::CallbackReturn MecanumDriveController::on_activate(

pid_controller/src/pid_controller.cpp

@@ -425,8 +425,9 @@ std::vector<hardware_interface::StateInterface> PidController::on_export_state_i
 
 bool PidController::on_set_chained_mode(bool chained_mode)
 {
-  // Always accept switch to/from chained mode
-  return true || chained_mode;
+  // Fix to adhere to CppLint standards
+  (void)chained_mode
+  return true;
 }
 
 controller_interface::CallbackReturn PidController::on_activate(

steering_controllers_library/src/steering_controllers_library.cpp

@@ -329,8 +329,9 @@ SteeringControllersLibrary::on_export_reference_interfaces()
 
 bool SteeringControllersLibrary::on_set_chained_mode(bool chained_mode)
 {
-  // Always accept switch to/from chained mode
-  return true || chained_mode;
+  // Fix to adhere to CppLint standards
+  (void)chained_mode
+  return true;
 }
 
 controller_interface::CallbackReturn SteeringControllersLibrary::on_activate(