mmc: mtk-sd: 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.

Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230727070051.17778-5-frank.li@vivo.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/mtk-sd.c

@@ -2885,7 +2885,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int msdc_drv_remove(struct platform_device *pdev)
+static void msdc_drv_remove(struct platform_device *pdev)
 {
 	struct mmc_host *mmc;
 	struct msdc_host *host;
@@ -2909,8 +2909,6 @@ static int msdc_drv_remove(struct platform_device *pdev)
 			host->dma.bd, host->dma.bd_addr);
 
 	mmc_free_host(mmc);
-
-	return 0;
 }
 
 static void msdc_save_reg(struct msdc_host *host)
@@ -3052,7 +3050,7 @@ static const struct dev_pm_ops msdc_dev_pm_ops = {
 
 static struct platform_driver mt_msdc_driver = {
 	.probe = msdc_drv_probe,
-	.remove = msdc_drv_remove,
+	.remove_new = msdc_drv_remove,
 	.driver = {
 		.name = "mtk-msdc",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,