clocksource: spelling error in watchdog code

There's more that need fixing, and fix my own subject spelling error too.
Signed-off-by: Daniel Walker <dwalker@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/time/clocksource.c

@@ -75,14 +75,14 @@ static struct timer_list watchdog_timer;
 static DEFINE_SPINLOCK(watchdog_lock);
 static cycle_t watchdog_last;
 /*
- * Interval: 0.5sec Treshold: 0.0625s
+ * Interval: 0.5sec Threshold: 0.0625s
  */
 #define WATCHDOG_INTERVAL (HZ >> 1)
-#define WATCHDOG_TRESHOLD (NSEC_PER_SEC >> 4)
+#define WATCHDOG_THRESHOLD (NSEC_PER_SEC >> 4)
 
 static void clocksource_ratewd(struct clocksource *cs, int64_t delta)
 {
-	if (delta > -WATCHDOG_TRESHOLD && delta < WATCHDOG_TRESHOLD)
+	if (delta > -WATCHDOG_THRESHOLD && delta < WATCHDOG_THRESHOLD)
 		return;
 
 	printk(KERN_WARNING "Clocksource %s unstable (delta = %Ld ns)\n",