net: ethernet: wiznet: 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 these drivers from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/wiznet/w5100.c

@@ -1062,11 +1062,9 @@ static int w5100_mmio_probe(struct platform_device *pdev)
 			   mac_addr, irq, data ? data->link_gpio : -EINVAL);
 }
 
-static int w5100_mmio_remove(struct platform_device *pdev)
+static void w5100_mmio_remove(struct platform_device *pdev)
 {
 	w5100_remove(&pdev->dev);
-
-	return 0;
 }
 
 void *w5100_ops_priv(const struct net_device *ndev)
@@ -1273,6 +1271,6 @@ static struct platform_driver w5100_mmio_driver = {
 		.pm	= &w5100_pm_ops,
 	},
 	.probe		= w5100_mmio_probe,
-	.remove		= w5100_mmio_remove,
+	.remove_new	= w5100_mmio_remove,
 };
 module_platform_driver(w5100_mmio_driver);

drivers/net/ethernet/wiznet/w5300.c

@@ -627,7 +627,7 @@ static int w5300_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int w5300_remove(struct platform_device *pdev)
+static void w5300_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct w5300_priv *priv = netdev_priv(ndev);
@@ -639,7 +639,6 @@ static int w5300_remove(struct platform_device *pdev)
 
 	unregister_netdev(ndev);
 	free_netdev(ndev);
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -683,7 +682,7 @@ static struct platform_driver w5300_driver = {
 		.pm	= &w5300_pm_ops,
 	},
 	.probe		= w5300_probe,
-	.remove		= w5300_remove,
+	.remove_new	= w5300_remove,
 };
 
 module_platform_driver(w5300_driver);