[PATCH:listres] Replace computed printf format string with static string

[Mark Kettenis]

> From: Alan Coopersmith <alan.coopersmith at oracle.com>
> Date: Fri, 10 Feb 2012 19:33:38 -0800
> 
> Allows format string analysis by gcc & other code checkers.
> 
> Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

Reviewed-by: Mark Kettenis <kettenis at openbsd.org>