[PATCH] iio: adc: ad7816: propagate SPI error codes

[Hungyu Lin]

The driver currently returns -EIO for SPI read/write failures,
which hides the actual error code returned by the SPI subsystem.

Return the original error code instead to allow better diagnostics
and error handling by callers.

Signed-off-by: Hungyu Lin <dennylin0707@xxxxxxxxx>
---
 drivers/staging/iio/adc/ad7816.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7816.c
index 0e32a2295990..9052203eb4f3 100644
--- a/drivers/staging/iio/adc/ad7816.c
+++ b/drivers/staging/iio/adc/ad7816.c
@@ -222,7 +222,7 @@ static ssize_t ad7816_show_value(struct device *dev,
 
 	ret = ad7816_spi_read(chip, &data);
 	if (ret)
-		return -EIO;
+		return ret;
 
 	data >>= AD7816_VALUE_OFFSET;
 
@@ -320,7 +320,7 @@ static inline ssize_t ad7816_set_oti(struct device *dev,
 
 	ret = ad7816_spi_write(chip, data);
 	if (ret)
-		return -EIO;
+		return ret;
 
 	chip->oti_data[chip->channel_id] = data;
 
-- 
2.34.1