[PATCH v3] iio: magnetometer: bmc150_magn: Used guard() for mutex protection

[Neel Bullywon <neelb2403@gmail.com>]

Replaced the manual mutex lock/unlock calls using guard() to simplify
the error handling and reduce goto statement usage.

By using RAII-style cleanup, it ensures the mutex is always released
when exiting the function, regardless of the return path taken.

Signed-off-by: Neel Bullywon <neelb2403@gmail.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
---
 drivers/iio/magnetometer/bmc150_magn.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/iio/magnetometer/bmc150_magn.c b/drivers/iio/magnetometer/bmc150_magn.c
index 6a73f6e2f1f0..bd2706c2078d 100644
--- a/drivers/iio/magnetometer/bmc150_magn.c
+++ b/drivers/iio/magnetometer/bmc150_magn.c
@@ -794,32 +794,25 @@ static int bmc150_magn_data_rdy_trigger_set_state(struct iio_trigger *trig,
 {
 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
 	struct bmc150_magn_data *data = iio_priv(indio_dev);
-	int ret = 0;
+	int ret;
+
+	guard(mutex)(&data->mutex);
 
-	mutex_lock(&data->mutex);
 	if (state == data->dready_trigger_on)
-		goto err_unlock;
+		return 0;
 
 	ret = regmap_update_bits(data->regmap, BMC150_MAGN_REG_INT_DRDY,
 				 BMC150_MAGN_MASK_DRDY_EN,
 				 state << BMC150_MAGN_SHIFT_DRDY_EN);
 	if (ret < 0)
-		goto err_unlock;
+		return ret;
 
 	data->dready_trigger_on = state;
 
-	if (state) {
-		ret = bmc150_magn_reset_intr(data);
-		if (ret < 0)
-			goto err_unlock;
-	}
-	mutex_unlock(&data->mutex);
+	if (state)
+		return bmc150_magn_reset_intr(data);
 
 	return 0;
-
-err_unlock:
-	mutex_unlock(&data->mutex);
-	return ret;
 }
 
 static const struct iio_trigger_ops bmc150_magn_trigger_ops = {
-- 
2.44.0