x86: hpet: Use proper destructor for delayed work

destroy_timer_on_stack() is hardly the right thing for a delayed
work. We leak a tracking object for the work itself when DEBUG_OBJECTS
is enabled.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/20140323141940.034005322@linutronix.deSigned-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/hpet.c

@@ -699,7 +699,7 @@ static int hpet_cpuhp_notify(struct notifier_block *n,
 		/* FIXME: add schedule_work_on() */
 		schedule_delayed_work_on(cpu, &work.work, 0);
 		wait_for_completion(&work.complete);
-		destroy_timer_on_stack(&work.work.timer);
+		destroy_delayed_work_on_stack(&work.work);
 		break;
 	case CPU_DEAD:
 		if (hdev) {