unobvious what effect this has and whether it matters much - we won't be
printing it out anyway if the timer's detached.

Untested, just an Ingo trollpatch.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>