ASoC: sh: rcar: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20230315150745.67084-133-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/core.c

@@ -1987,7 +1987,7 @@ static int rsnd_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int rsnd_remove(struct platform_device *pdev)
+static void rsnd_remove(struct platform_device *pdev)
 {
 	struct rsnd_priv *priv = dev_get_drvdata(&pdev->dev);
 	struct rsnd_dai *rdai;
@@ -2019,8 +2019,6 @@ static int rsnd_remove(struct platform_device *pdev)
 
 	for (i = 0; i < ARRAY_SIZE(remove_func); i++)
 		remove_func[i](priv);
-
-	return 0;
 }
 
 static int __maybe_unused rsnd_suspend(struct device *dev)
@@ -2052,7 +2050,7 @@ static struct platform_driver rsnd_driver = {
 		.of_match_table = rsnd_of_match,
 	},
 	.probe		= rsnd_probe,
-	.remove		= rsnd_remove,
+	.remove_new	= rsnd_remove,
 };
 module_platform_driver(rsnd_driver);