staging/iio/mxs-lradc: cleanup masklength

We know the exact iio->masklength = LRADC_MAX_TOTAL_CHANS.
Let's use it consistently.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
1 file changed