gpio-pch: cleanup NULL pointer checking

This patch will remove the following sparse warning ("make C=1"):
 * warning: Using plain integer as NULL pointer

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c
index f060329..7f008fb 100644
--- a/drivers/gpio/gpio-pch.c
+++ b/drivers/gpio/gpio-pch.c
@@ -376,7 +376,7 @@
 	}
 
 	chip->base = pci_iomap(pdev, 1, 0);
-	if (chip->base == 0) {
+	if (!chip->base) {
 		dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
 		ret = -ENOMEM;
 		goto err_iomap;