MFP4(129048): Eliminating an unnecessary check on an_gone inside an_stats_update() since a properly locked callout_stop(9) does do the right thing.
MFP4(129048): Eliminating an unnecessary check on an_gone inside
an_stats_update() since a properly locked callout_stop(9) does do the
right thing.

Reviewed by:	ambrisko, jhb
MFC after:	3 days

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