Print the reply from &devices() and highlight errors.

def print_devices_change_callback(devices, key, new):
    """Print the reply from &devices() and highlight errors."""
    dev = devices[key]
    print('- ', new, ' ', dev)
    if dev['type'] == QSType.unknown:
        print(" ERR decoding")
    elif dev['value'] == -1:
        dev(" ERR decoding: -1?")
    qcord = pyqwikswitch.decode_qwikcord(dev['data'][pyqwikswitch.QS_VALUE])
    if qcord is not None:
        print(' qwikcord (CTAVG, CTsum) = ' + str(qcord))