watchdog: mpc8xxx_wdt: fix build

Since 1c48a5c9 (dt: Eliminate of_platform_{,un}register_driver)
mpc8xxx_wdt no longer builds as it tries to refer to a 'match' variable
rather than ofdev->dev.of_match that it checks just before.
Signed-off-by: NPeter Korsgaard <jacmet@sunsite.dk>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

drivers/watchdog/mpc8xxx_wdt.c

@@ -195,7 +195,7 @@ static int __devinit mpc8xxx_wdt_probe(struct platform_device *ofdev)
 
 	if (!ofdev->dev.of_match)
 		return -EINVAL;
-	wdt_type = match->data;
+	wdt_type = ofdev->dev.of_match->data;
 
 	if (!freq || freq == -1)
 		return -EINVAL;