ktrace_resize_pool() locking slightly reworked: 1) do not take a lock around the single atomic operation. 2) do not lose the invariant of lock by dropping/acquiring    ktrace_mtx around free() or malloc().
ktrace_resize_pool() locking slightly reworked:
1) do not take a lock around the single atomic operation.
2) do not lose the invariant of lock by dropping/acquiring
   ktrace_mtx around free() or malloc().

MFC after:	1 Month.

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