rt_newaddrmsg will blow up if given something other than RTM_ADD or RTM_DELETE; add an assertion, may want to do something more heavyhanded in the future
rt_newaddrmsg will blow up if given something other than RTM_ADD
or RTM_DELETE; add an assertion, may want to do something more
heavyhanded in the future

Noticed by:	Coverity Prevent analysis tool
Reviewed by:	mdodd

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