sched_setaffinity.2: Correct details of return value of sched_getaffinity() syscall

Things changed a little with:

    commit cd3d8031eb4311e516329aee03c79a08333141f1
    Author: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Date:   Fri Mar 12 16:15:36 2010 +0900

Reported-by: Brice Goglin <Brice.Goglin@inria.fr>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
1 file changed