sofree patches

[Stephen Degler <stephen@xxxxxxxxxx>]

This should fix two issues I'm seeing.

1) Crashes with netkey sockets during ipsec processing 
ipsec_getpolicybysock (null inpcb assertion in getpolicybysock)
2) Crashes with so_lock assertions in sbappendaddr during key exchanges.

sofree should not be called because its essentially a double free (pool 
put).