When running with debug.mpsafenet=0, initialize IP multicast routing callouts as non-CALLOUT_MPSAFE.  Otherwise, they may trigger an assertion regarding Giant if they enter other parts of the stack from the callout.
When running with debug.mpsafenet=0, initialize IP multicast routing
callouts as non-CALLOUT_MPSAFE.  Otherwise, they may trigger an
assertion regarding Giant if they enter other parts of the stack from
the callout.

MFC after:	3 days
Reported by:	Dikshie < dikshie at ppk dot itb dot ac dot id >

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