PCI: mediatek-gen3: 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/20230321193208.366561-11-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

drivers/pci/controller/pcie-mediatek-gen3.c

@@ -943,7 +943,7 @@ static int mtk_pcie_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int mtk_pcie_remove(struct platform_device *pdev)
+static void mtk_pcie_remove(struct platform_device *pdev)
 {
 	struct mtk_gen3_pcie *pcie = platform_get_drvdata(pdev);
 	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
@@ -955,8 +955,6 @@ static int mtk_pcie_remove(struct platform_device *pdev)
 
 	mtk_pcie_irq_teardown(pcie);
 	mtk_pcie_power_down(pcie);
-
-	return 0;
 }
 
 static void mtk_pcie_irq_save(struct mtk_gen3_pcie *pcie)
@@ -1069,7 +1067,7 @@ MODULE_DEVICE_TABLE(of, mtk_pcie_of_match);
 
 static struct platform_driver mtk_pcie_driver = {
 	.probe = mtk_pcie_probe,
-	.remove = mtk_pcie_remove,
+	.remove_new = mtk_pcie_remove,
 	.driver = {
 		.name = "mtk-pcie-gen3",
 		.of_match_table = mtk_pcie_of_match,