• Fix an error that occurs when mp_ncpu is an odd number. steal_thresh is calculated as 0 which causes errors elsewhere.

Submitted by: KOIE Hidetaka <koie@suri.co.jp>

• When sched_affinity() is called with a thread that is not curthread we need to handle the ON_RUNQ() case by adding the thread to the correct run queue.

Submitted by: Justin Teller <justin.teller@gmail.com>

MFC after: 1 Week