PCI: xgene-msi: 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/20230321193208.366561-16-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/pci-xgene-msi.c

@@ -348,7 +348,7 @@ static void xgene_msi_isr(struct irq_desc *desc)
 
 static enum cpuhp_state pci_xgene_online;
 
-static int xgene_msi_remove(struct platform_device *pdev)
+static void xgene_msi_remove(struct platform_device *pdev)
 {
 	struct xgene_msi *msi = platform_get_drvdata(pdev);
 
@@ -362,8 +362,6 @@ static int xgene_msi_remove(struct platform_device *pdev)
 	msi->bitmap = NULL;
 
 	xgene_free_domains(msi);
-
-	return 0;
 }
 
 static int xgene_msi_hwirq_alloc(unsigned int cpu)
@@ -521,7 +519,7 @@ static struct platform_driver xgene_msi_driver = {
 		.of_match_table = xgene_msi_match_table,
 	},
 	.probe = xgene_msi_probe,
-	.remove = xgene_msi_remove,
+	.remove_new = xgene_msi_remove,
 };
 
 static int __init xgene_pcie_msi_init(void)