iio: dac: ad5592r: Make ad5592r_remove() return void

Up to now ad5592r_remove() returns zero unconditionally. Make it return
void instead which makes it easier to see in the callers that there is
no error to handle.

Also the return value of i2c and spi remove callbacks is ignored anyway.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Link: https://lore.kernel.org/r/20211013203223.2694577-10-u.kleine-koenig@pengutronix.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/dac/ad5592r-base.c

@@ -663,7 +663,7 @@ int ad5592r_probe(struct device *dev, const char *name,
 }
 EXPORT_SYMBOL_GPL(ad5592r_probe);
 
-int ad5592r_remove(struct device *dev)
+void ad5592r_remove(struct device *dev)
 {
 	struct iio_dev *iio_dev = dev_get_drvdata(dev);
 	struct ad5592r_state *st = iio_priv(iio_dev);
@@ -674,8 +674,6 @@ int ad5592r_remove(struct device *dev)
 
 	if (st->reg)
 		regulator_disable(st->reg);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(ad5592r_remove);
 

drivers/iio/dac/ad5592r-base.h

@@ -71,6 +71,6 @@ struct ad5592r_state {
 
 int ad5592r_probe(struct device *dev, const char *name,
 		const struct ad5592r_rw_ops *ops);
-int ad5592r_remove(struct device *dev);
+void ad5592r_remove(struct device *dev);
 
 #endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */

drivers/iio/dac/ad5592r.c

@@ -132,7 +132,9 @@ static int ad5592r_spi_probe(struct spi_device *spi)
 
 static int ad5592r_spi_remove(struct spi_device *spi)
 {
-	return ad5592r_remove(&spi->dev);
+	ad5592r_remove(&spi->dev);
+
+	return 0;
 }
 
 static const struct spi_device_id ad5592r_spi_ids[] = {

drivers/iio/dac/ad5593r.c

@@ -99,7 +99,9 @@ static int ad5593r_i2c_probe(struct i2c_client *i2c,
 
 static int ad5593r_i2c_remove(struct i2c_client *i2c)
 {
-	return ad5592r_remove(&i2c->dev);
+	ad5592r_remove(&i2c->dev);
+
+	return 0;
 }
 
 static const struct i2c_device_id ad5593r_i2c_ids[] = {