drivers/watchdog: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/watchdog/ath79_wdt.c

@@ -248,11 +248,6 @@ static int ath79_wdt_probe(struct platform_device *pdev)
 		return -EBUSY;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no memory resource found\n");
-		return -EINVAL;
-	}
-
 	wdt_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(wdt_base))
 		return PTR_ERR(wdt_base);