pin ADC_TEMPERATURE used multiple times in config

pin ADC_TEMPERATURE used multiple times in config

Traceback (most recent call last):
  File "/home/pi/klipper/klippy/klippy.py", line 175, in _connect
    self._read_config()
  File "/home/pi/klipper/klippy/klippy.py", line 141, in _read_config
    self.load_object(config, section_config.get_name(), None)
  File "/home/pi/klipper/klippy/klippy.py", line 130, in load_object
    self.objects[section] = init_func(config.getsection(section))
  File "/home/pi/klipper/klippy/extras/temperature_sensor.py", line 42, in load_config_prefix
    return PrinterSensorGeneric(config)
  File "/home/pi/klipper/klippy/extras/temperature_sensor.py", line 14, in __init__
    self.sensor = pheaters.setup_sensor(config)
  File "/home/pi/klipper/klippy/extras/heaters.py", line 285, in setup_sensor
    return self.sensor_factories[sensor_type](config)
  File "/home/pi/klipper/klippy/extras/temperature_mcu.py", line 31, in __init__
    self.mcu_adc = ppins.setup_pin('adc',
  File "/home/pi/klipper/klippy/pins.py", line 117, in setup_pin
    pin_params = self.lookup_pin(pin_desc, can_invert, can_pullup)
  File "/home/pi/klipper/klippy/pins.py", line 106, in lookup_pin
    raise error("pin %s used multiple times in config" % (pin,))
pins.error: pin ADC_TEMPERATURE used multiple times in config