qcacmn: Remove assert in Scheduler thread post message path

In situations where the scheduler thread has been stopped, but some
threads are still trying to post massages to it, a particular assert
can be triggered excessively. Remove the post message assert when the
scheduler thread is stopped, and instead simply log an error.

Change-Id: I5b898dc3ea22bbedcdf2287ef6f3bcee1560bb6b
CRs-Fixed: 2046232
1 file changed