ASoC: pcm1789: Make pcm1789_common_exit() return void

This function returns zero unconditionally, so there isn't any benefit
of returning a value. Make it return void to be able to see at a glance
that the return value of pcm1789_i2c_remove() is always zero.

This patch is a preparation for making i2c remove callbacks return void.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220425193023.61046-1-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/pcm1789-i2c.c

@@ -29,7 +29,9 @@ static int pcm1789_i2c_probe(struct i2c_client *client)
 
 static int pcm1789_i2c_remove(struct i2c_client *client)
 {
-	return pcm1789_common_exit(&client->dev);
+	pcm1789_common_exit(&client->dev);
+
+	return 0;
 }
 
 #ifdef CONFIG_OF

sound/soc/codecs/pcm1789.c

@@ -259,13 +259,11 @@ int pcm1789_common_init(struct device *dev, struct regmap *regmap)
 }
 EXPORT_SYMBOL_GPL(pcm1789_common_init);
 
-int pcm1789_common_exit(struct device *dev)
+void pcm1789_common_exit(struct device *dev)
 {
 	struct pcm1789_private *priv = dev_get_drvdata(dev);
 
 	flush_work(&priv->work);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(pcm1789_common_exit);
 

sound/soc/codecs/pcm1789.h

@@ -12,6 +12,6 @@
 extern const struct regmap_config pcm1789_regmap_config;
 
 int pcm1789_common_init(struct device *dev, struct regmap *regmap);
-int pcm1789_common_exit(struct device *dev);
+void pcm1789_common_exit(struct device *dev);
 
 #endif