PM / Freezer: Fix small typo "regrigerator"

Noticed when digging into a suspend issue in linux-next (next-20120821).

For more details see <http://marc.info/?t=134554708000002&r=1&w=2>.
Signed-off-by: NSedat Dilek <sedat.dilek@gmail.com>
Acked-by: NPavel Machek <pavel@ucw.cz>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>

kernel/power/process.c

@@ -79,7 +79,7 @@ static int try_to_freeze_tasks(bool user_only)
 
 		/*
 		 * We need to retry, but first give the freezing tasks some
-		 * time to enter the regrigerator.
+		 * time to enter the refrigerator.
 		 */
 		msleep(10);
 	}