watchdog: sunxi_wdt: use of_device_get_match_data

The usage of of_device_get_match_data reduce the code size a bit.
Furthermore, it prevents an improbable dereference when
of_match_device() return NULL.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/sunxi_wdt.c

@@ -234,7 +234,6 @@ MODULE_DEVICE_TABLE(of, sunxi_wdt_dt_ids);
 static int sunxi_wdt_probe(struct platform_device *pdev)
 {
 	struct sunxi_wdt_dev *sunxi_wdt;
-	const struct of_device_id *device;
 	struct resource *res;
 	int err;
 
@@ -242,12 +241,10 @@ static int sunxi_wdt_probe(struct platform_device *pdev)
 	if (!sunxi_wdt)
 		return -EINVAL;
 
-	device = of_match_device(sunxi_wdt_dt_ids, &pdev->dev);
-	if (!device)
+	sunxi_wdt->wdt_regs = of_device_get_match_data(&pdev->dev);
+	if (!sunxi_wdt->wdt_regs)
 		return -ENODEV;
 
-	sunxi_wdt->wdt_regs = device->data;
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	sunxi_wdt->wdt_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(sunxi_wdt->wdt_base))