[PATCH v2 2/4] iio: magnetometer: rm3100: Use scoped_guard() in rm3100_get_samp_freq()

[Maxwell Doose <m32285159@gmail.com>]

Replace mutex_lock() and mutex_unlock() calls in rm3100_get_samp_freq()
with the more modern scoped_guard(). This will help modernize the
driver and bring it up-to-date with modern available macros/functions.

Signed-off-by: Maxwell Doose <m32285159@gmail.com>
---
 v2:
 - Move if statement into scoped_guard body per Andy.

 drivers/iio/magnetometer/rm3100-core.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/magnetometer/rm3100-core.c b/drivers/iio/magnetometer/rm3100-core.c
index 426963935d60..9f25efb2d02d 100644
--- a/drivers/iio/magnetometer/rm3100-core.c
+++ b/drivers/iio/magnetometer/rm3100-core.c
@@ -280,11 +280,12 @@ static int rm3100_get_samp_freq(struct rm3100_data *data, int *val, int *val2)
 	unsigned int tmp;
 	int ret;
 
-	mutex_lock(&data->lock);
-	ret = regmap_read(data->regmap, RM3100_REG_TMRC, &tmp);
-	mutex_unlock(&data->lock);
-	if (ret < 0)
-		return ret;
+	scoped_guard(mutex, &data->lock) {
+		ret = regmap_read(data->regmap, RM3100_REG_TMRC, &tmp);
+
+		if (ret < 0)
+			return ret;
+	}
 	*val = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][0];
 	*val2 = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][1];
 
-- 
2.53.0