net: ethernet: cadence: 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 ignored (apart
from emitting a warning) 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. Eventually after all drivers
are converted, .remove_new() is renamed to .remove().

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@tuxon.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb_main.c

@@ -5156,7 +5156,7 @@ static int macb_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int macb_remove(struct platform_device *pdev)
+static void macb_remove(struct platform_device *pdev)
 {
 	struct net_device *dev;
 	struct macb *bp;
@@ -5181,8 +5181,6 @@ static int macb_remove(struct platform_device *pdev)
 		phylink_destroy(bp->phylink);
 		free_netdev(dev);
 	}
-
-	return 0;
 }
 
 static int __maybe_unused macb_suspend(struct device *dev)
@@ -5398,7 +5396,7 @@ static const struct dev_pm_ops macb_pm_ops = {
 
 static struct platform_driver macb_driver = {
 	.probe		= macb_probe,
-	.remove		= macb_remove,
+	.remove_new	= macb_remove,
 	.driver		= {
 		.name		= "macb",
 		.of_match_table	= of_match_ptr(macb_dt_ids),