iio: st_sensors: Return as early as possible from the _write_raw() callbacks

As there is no cleanup to do, let's return as early as possible in the
various ST sensor drivers _write_raw() callback functions.

There is no functional change.
Suggested-by: Jonathan Cameron <jic23@kernel.org>
Cc: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20220207143840.707510-5-miquel.raynal@bootlin.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/st_accel_core.c

@@ -1217,8 +1217,7 @@ static int st_accel_write_raw(struct iio_dev *indio_dev,
 		int gain;
 
 		gain = val * 1000000 + val2;
-		err = st_sensors_set_fullscale_by_gain(indio_dev, gain);
-		break;
+		return st_sensors_set_fullscale_by_gain(indio_dev, gain);
 	}
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		if (val2)
@@ -1230,8 +1229,6 @@ static int st_accel_write_raw(struct iio_dev *indio_dev,
 	default:
 		return -EINVAL;
 	}
-
-	return err;
 }
 
 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();

drivers/iio/gyro/st_gyro_core.c

@@ -410,8 +410,7 @@ static int st_gyro_write_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_SCALE:
-		err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
-		break;
+		return st_sensors_set_fullscale_by_gain(indio_dev, val2);
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		if (val2)
 			return -EINVAL;
@@ -420,10 +419,8 @@ static int st_gyro_write_raw(struct iio_dev *indio_dev,
 		mutex_unlock(&indio_dev->mlock);
 		return err;
 	default:
-		err = -EINVAL;
+		return -EINVAL;
 	}
-
-	return err;
 }
 
 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();

drivers/iio/magnetometer/st_magn_core.c

@@ -544,8 +544,7 @@ static int st_magn_write_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_SCALE:
-		err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
-		break;
+		return st_sensors_set_fullscale_by_gain(indio_dev, val2);
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		if (val2)
 			return -EINVAL;
@@ -554,10 +553,8 @@ static int st_magn_write_raw(struct iio_dev *indio_dev,
 		mutex_unlock(&indio_dev->mlock);
 		return err;
 	default:
-		err = -EINVAL;
+		return -EINVAL;
 	}
-
-	return err;
 }
 
 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();