serial: fsl_lpuart: clear unsupported options in .rs485_config()
The struct serial_rs485 parameter is both input and output and is supposed to hold the actually used configuration on return. So clear unsupported settings. Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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