[PATCH v1 4/4] iio: adc: pac1934: Unshadow error codes in ->store()

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

kstrtox() may return different error codes.

Unshadow them in the ->store() callback to give better error report.

While at it, add missing kstrtox.h inclusion.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/iio/adc/pac1934.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/pac1934.c b/drivers/iio/adc/pac1934.c
index 23055405a6e0..2d934452eb11 100644
--- a/drivers/iio/adc/pac1934.c
+++ b/drivers/iio/adc/pac1934.c
@@ -19,6 +19,7 @@
 #include <linux/i2c.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
+#include <linux/kstrtox.h>
 #include <linux/unaligned.h>
 
 /*
@@ -494,11 +495,13 @@ static ssize_t pac1934_shunt_value_store(struct device *dev,
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct pac1934_chip_info *info = iio_priv(indio_dev);
 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-	int sh_val;
+	unsigned int sh_val;
+	int ret;
 
-	if (kstrtouint(buf, 10, &sh_val)) {
+	ret = kstrtouint(buf, 10, &sh_val);
+	if (ret) {
 		dev_err(dev, "Shunt value is not valid\n");
-		return -EINVAL;
+		return ret;
 	}
 
 	scoped_guard(mutex, &info->lock)
-- 
2.50.1