PCI: mt7621: 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.

Link: https://lore.kernel.org/linux-pci/20230321193208.366561-12-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>

Author: Uwe Kleine-König

drivers/pci/controller/pcie-mt7621.c

@@ -524,15 +524,13 @@ static int mt7621_pcie_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int mt7621_pcie_remove(struct platform_device *pdev)
+static void mt7621_pcie_remove(struct platform_device *pdev)
 {
 	struct mt7621_pcie *pcie = platform_get_drvdata(pdev);
 	struct mt7621_pcie_port *port;
 
 	list_for_each_entry(port, &pcie->ports, list)
 		reset_control_put(port->pcie_rst);
-
-	return 0;
 }
 
 static const struct of_device_id mt7621_pcie_ids[] = {
@@ -543,7 +541,7 @@ MODULE_DEVICE_TABLE(of, mt7621_pcie_ids);
 
 static struct platform_driver mt7621_pcie_driver = {
 	.probe = mt7621_pcie_probe,
-	.remove = mt7621_pcie_remove,
+	.remove_new = mt7621_pcie_remove,
 	.driver = {
 		.name = "mt7621-pci",
 		.of_match_table = mt7621_pcie_ids,