watchdog: WatchDog Timer Driver Core: fix comment

Signed-off-by: NFabio Porcedda <fabio.porcedda@gmail.com>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

include/linux/watchdog.h

@@ -129,7 +129,7 @@ static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
 	return wdd->driver_data;
 }
 
-/* drivers/watchdog/core/watchdog_core.c */
+/* drivers/watchdog/watchdog_core.c */
 extern int watchdog_register_device(struct watchdog_device *);
 extern void watchdog_unregister_device(struct watchdog_device *);