Fix memory leak in case of adding a host route on top of another one.
Fix memory leak in case of adding a host route on top of another one.

Pointed-out-by:  Bill Fenner <c4ea42f2f30862b8c08e4e32f18f70490074163c@parc.xerox.com>

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