 - KSE may free a thread that was never actually forked.  This will leave    td_cpuset NULL.  Check for this condition before dereferencing the    cpuset.
 - KSE may free a thread that was never actually forked.  This will leave
   td_cpuset NULL.  Check for this condition before dereferencing the
   cpuset.

Reported by:	david@catwhisker.org, miwi@freebsd.org
Sponsored by:	Nokia

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