iio: adc: ad_sigma_delta: change to buffer predisable

Change the buffer disable callback from postdisable to predisable.
This balances the existing posteanble callback. Using postdisable
with posteanble can be problematic, for example, if update_scan_mode
fails, it would call postdisable without ever having called posteanble,
so the drivers using this would be in an unexpected state when
postdisable was called.

Fixes: af30084 ("iio:adc: Add common code for ADI Sigma Delta devices")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250703-iio-adc-ad_sigma_delta-buffer-predisable-v1-1-f2ab85138f1f@baylibre.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: dlech

drivers/iio/adc/ad_sigma_delta.c

@@ -582,7 +582,7 @@ static int ad_sd_buffer_postenable(struct iio_dev *indio_dev)
 	return ret;
 }
 
-static int ad_sd_buffer_postdisable(struct iio_dev *indio_dev)
+static int ad_sd_buffer_predisable(struct iio_dev *indio_dev)
 {
 	struct ad_sigma_delta *sigma_delta = iio_device_get_drvdata(indio_dev);
 
@@ -682,7 +682,7 @@ static bool ad_sd_validate_scan_mask(struct iio_dev *indio_dev, const unsigned l
 
 static const struct iio_buffer_setup_ops ad_sd_buffer_setup_ops = {
 	.postenable = &ad_sd_buffer_postenable,
-	.postdisable = &ad_sd_buffer_postdisable,
+	.predisable = &ad_sd_buffer_predisable,
 	.validate_scan_mask = &ad_sd_validate_scan_mask,
 };