stop() no longer needs sched_lock held; in fact, holding sched_lock causes a LOR against sleepq.  Fix the comment, and fix ptracestop() to pick up sched_lock after stop() rather than before.
stop() no longer needs sched_lock held; in fact, holding sched_lock causes
a LOR against sleepq.  Fix the comment, and fix ptracestop() to pick up
sched_lock after stop() rather than before.

Reported by:	Scott Sipe <cscotts@mindspring.com>
Reviewed by:	rwatson, jhb

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase