Fix a bug found by dim@: Don't use an uninitilized variable, if INVARIANTS is on and an illegal packet with destination 0 is received.
Fix a bug found by dim@:
Don't use an uninitilized variable, if INVARIANTS is on and an illegal
packet with destination 0 is received.

MFC after:	3 days
X-MFC with:	238003

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