Don't leak softc's when destroying interfaces.
Don't leak softc's when destroying interfaces.

Init the softc list when loaded.

Noticed by:	Maurycy Pawlowski-Wieronski <maurycy at fouk dot org>

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