Remove an assertion that is no longer correct with the addition of sx_sleep().  During sx_sleep(), we drop the sleepqueue chain lock after putting the thread on the queue but before checking for signals while we release the sx lock.  If another thread wakes up the thread that is about to go to sleep during that window, then TDF_SINTR won't be set when the current thread checks for signals.  Thus, it isn't accurate to always assert that that flag is set here anymore.
Remove an assertion that is no longer correct with the addition of
sx_sleep().  During sx_sleep(), we drop the sleepqueue chain lock after
putting the thread on the queue but before checking for signals while
we release the sx lock.  If another thread wakes up the thread that is
about to go to sleep during that window, then TDF_SINTR won't be set when
the current thread checks for signals.  Thus, it isn't accurate to always
assert that that flag is set here anymore.

Reported by:	peter
Approved by:	re (kib)

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