[PATCH v1 2/4] iio: imu: inv_mpu6050: 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/imu/inv_mpu6050/inv_mpu_core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 5796896d54cd..38c3f3b398d4 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -13,6 +13,7 @@
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/acpi.h>
+#include <linux/kstrtox.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/math64.h>
@@ -1303,8 +1304,9 @@ inv_mpu6050_fifo_rate_store(struct device *dev, struct device_attribute *attr,
 	struct inv_mpu6050_state *st = iio_priv(indio_dev);
 	struct device *pdev = regmap_get_device(st->map);
 
-	if (kstrtoint(buf, 10, &fifo_rate))
-		return -EINVAL;
+	result = kstrtoint(buf, 10, &fifo_rate);
+	if (result)
+		return result;
 	if (fifo_rate < INV_MPU6050_MIN_FIFO_RATE ||
 	    fifo_rate > INV_MPU6050_MAX_FIFO_RATE)
 		return -EINVAL;
-- 
2.50.1