iio: adc: mxs-lradc-adc: don't set masklength

The masklength field is marked as [INTERN] and should not be set by
drivers, so remove the assignment in the mxs-lradc-adc driver.

__iio_device_register() will populate this field with the correct value.

Signed-off-by: David Lechner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/mxs-lradc-adc.c

···
 	iio->dev.of_node = dev->parent->of_node;
 	iio->info = &mxs_lradc_adc_iio_info;
 	iio->modes = INDIO_DIRECT_MODE;
-	iio->masklength = LRADC_MAX_TOTAL_CHANS;
 
 	if (lradc->soc == IMX23_LRADC) {
 		iio->channels = mx23_lradc_chan_spec;