rtc: stmp3xxx: 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>
Link: https://lore.kernel.org/r/20230304133028.2135435-34-u.kleine-koenig@pengutronix.de
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: Uwe Kleine-König

drivers/rtc/rtc-stmp3xxx.c

@@ -232,17 +232,15 @@ static const struct rtc_class_ops stmp3xxx_rtc_ops = {
 	.set_alarm	= stmp3xxx_rtc_set_alarm,
 };
 
-static int stmp3xxx_rtc_remove(struct platform_device *pdev)
+static void stmp3xxx_rtc_remove(struct platform_device *pdev)
 {
 	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev);
 
 	if (!rtc_data)
-		return 0;
+		return;
 
 	writel(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN,
 		rtc_data->io + STMP3XXX_RTC_CTRL + STMP_OFFSET_REG_CLR);
-
-	return 0;
 }
 
 static int stmp3xxx_rtc_probe(struct platform_device *pdev)
@@ -406,7 +404,7 @@ MODULE_DEVICE_TABLE(of, rtc_dt_ids);
 
 static struct platform_driver stmp3xxx_rtcdrv = {
 	.probe		= stmp3xxx_rtc_probe,
-	.remove		= stmp3xxx_rtc_remove,
+	.remove_new	= stmp3xxx_rtc_remove,
 	.driver		= {
 		.name	= "stmp3xxx-rtc",
 		.pm	= &stmp3xxx_rtc_pm_ops,