net: ag71xx: use devm for register_netdev

Allows completely removing the remove function. Nothing is being done
manually now.

Tested on TP-LINK Archer C7v2.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20240813170516.7301-4-rosenp@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/atheros/ag71xx.c

@@ -1925,7 +1925,7 @@ static int ag71xx_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	err = register_netdev(ndev);
+	err = devm_register_netdev(&pdev->dev, ndev);
 	if (err) {
 		netif_err(ag, probe, ndev, "unable to register net device\n");
 		platform_set_drvdata(pdev, NULL);
@@ -1939,17 +1939,6 @@ static int ag71xx_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static void ag71xx_remove(struct platform_device *pdev)
-{
-	struct net_device *ndev = platform_get_drvdata(pdev);
-
-	if (!ndev)
-		return;
-
-	unregister_netdev(ndev);
-	platform_set_drvdata(pdev, NULL);
-}
-
 static const u32 ar71xx_fifo_ar7100[] = {
 	0x0fff0000, 0x00001fff, 0x00780fff,
 };
@@ -2034,7 +2023,6 @@ static const struct of_device_id ag71xx_match[] = {
 
 static struct platform_driver ag71xx_driver = {
 	.probe		= ag71xx_probe,
-	.remove_new	= ag71xx_remove,
 	.driver = {
 		.name	= "ag71xx",
 		.of_match_table = ag71xx_match,