Fixes for clang-tidy

..._control/include/franka_control/franka_state_controller.h

franka_control/src/franka_control_node.cpp

franka_control/src/franka_state_controller.cpp

...ontrollers/src/cartesian_impedance_example_controller.cpp

...ple_controllers/src/cartesian_pose_example_controller.cpp

...controllers/src/cartesian_velocity_example_controller.cpp

franka_example_controllers/src/elbow_example_controller.cpp

franka_example_controllers/src/force_example_controller.cpp

...le_controllers/src/joint_impedance_example_controller.cpp

franka_example_controllers/src/model_example_controller.cpp

franka_gripper/src/franka_gripper_node.cpp

franka_hw/include/franka_hw/franka_hw.h

franka_hw/src/franka_hw.cpp