- Move IF_ADDR_LOCK_DESTROY(ifp) from if_free to if_free_type. - Add a note that additions should be made to if_free_type and not   if_free to help avoid this in the future.
- Move IF_ADDR_LOCK_DESTROY(ifp) from if_free to if_free_type.
- Add a note that additions should be made to if_free_type and not
  if_free to help avoid this in the future.

This apparently fixes a use after free in if_bridge and may fix bugs
in other direct if_free_type consumers.

Reported by:	thompsa

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