[PATCH v2] iio: adc: ad4170-4: Use ERR_PTR() with %pe to improve error logging

[Salah Triki <salah.triki@gmail.com>]

Use `ERR_PTR(ret)` with `%pe` in `ad4170_read_sample()` to properly display
symbolic error codes (e.g. `-ENOMEM`) instead of raw integers (e.g. `-12`),
improving readability and debug clarity.

Signed-off-by: Salah Triki <salah.triki@gmail.com>
---
Changes in v2:
   - Improve commit title

 drivers/iio/adc/ad4170-4.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/ad4170-4.c b/drivers/iio/adc/ad4170-4.c
index 6cd84d6fb08b..6296b5dc930b 100644
--- a/drivers/iio/adc/ad4170-4.c
+++ b/drivers/iio/adc/ad4170-4.c
@@ -1253,11 +1253,11 @@ static int ad4170_read_sample(struct iio_dev *indio_dev,
 
 	ret = __ad4170_read_sample(indio_dev, chan, val);
 	if (ret) {
-		dev_err(dev, "failed to read sample: %d\n", ret);
+		dev_err(dev, "failed to read sample: %pe\n", ERR_PTR(ret));
 
 		ret2 = ad4170_set_channel_enable(st, chan->address, false);
 		if (ret2)
-			dev_err(dev, "failed to disable channel: %d\n", ret2);
+			dev_err(dev, "failed to disable channel: %pe\n", ERR_PTR(ret2));
 
 		return ret;
 	}
-- 
2.43.0