ASoC: atmel: sam9x5_wm8731: 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>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20230315150745.67084-33-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/atmel/sam9x5_wm8731.c

@@ -176,14 +176,12 @@ static int sam9x5_wm8731_driver_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int sam9x5_wm8731_driver_remove(struct platform_device *pdev)
+static void sam9x5_wm8731_driver_remove(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);
 	struct sam9x5_drvdata *priv = card->drvdata;
 
 	atmel_ssc_put_audio(priv->ssc_id);
-
-	return 0;
 }
 
 static const struct of_device_id sam9x5_wm8731_of_match[] = {
@@ -198,7 +196,7 @@ static struct platform_driver sam9x5_wm8731_driver = {
 		.of_match_table = of_match_ptr(sam9x5_wm8731_of_match),
 	},
 	.probe = sam9x5_wm8731_driver_probe,
-	.remove = sam9x5_wm8731_driver_remove,
+	.remove_new = sam9x5_wm8731_driver_remove,
 };
 module_platform_driver(sam9x5_wm8731_driver);