iio: buffer: initialize masklength accumulator to 0

Since masklength is marked as [INTERN], no drivers should assign it and
the value will always be 0. Therefore, the local ml accumulator variable
in iio_buffers_alloc_sysfs_and_mask() will always start out as 0.

This changes the code to explicitly set ml to 0 to make it clear that
drivers should not be trying to override the masklength field.

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

drivers/iio/industrialio-buffer.c

···
 
 	channels = indio_dev->channels;
 	if (channels) {
-		int ml = indio_dev->masklength;
+		int ml = 0;
 
 		for (i = 0; i < indio_dev->num_channels; i++)
 			ml = max(ml, channels[i].scan_index + 1);