[PATCH] iio: adc: mt6359: fix unchecked return value in mt6358_read_imp

[Salah Triki]

In mt6358_read_imp(), the return value of regmap_read() is currently
ignored. This is problematic because if the bus read fails the variable
val_v remains uninitialized.

The function subsequently assigns this uninitialized stack value to
*vbat, leading to incorrect measurement results being reported to
the IIO subsystem without any error indication.

Update the function to check the return value of regmap_read(). Ensure
that mt6358_stop_imp_conv() is still called to clean up the hardware
state before returning the error code.

Signed-off-by: Salah Triki <salah.triki at gmail.com>
---
 drivers/iio/adc/mt6359-auxadc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/mt6359-auxadc.c b/drivers/iio/adc/mt6359-auxadc.c
index 6b9ed9b1fde2..f927bff4a26a 100644
--- a/drivers/iio/adc/mt6359-auxadc.c
+++ b/drivers/iio/adc/mt6359-auxadc.c
@@ -497,10 +497,13 @@ static int mt6358_read_imp(struct mt6359_auxadc *adc_dev,
 		return ret;
 
 	/* Read the params before stopping */
-	regmap_read(regmap, reg_adc0 + (cinfo->imp_adc_num << 1), &val_v);
+	ret = regmap_read(regmap, reg_adc0 + (cinfo->imp_adc_num << 1), &val_v);
 
 	mt6358_stop_imp_conv(adc_dev);
 
+	if (ret)
+		return ret;
+
 	if (vbat)
 		*vbat = val_v;
 	if (ibat)
-- 
2.43.0