util/sockopt: fix forward-declaration of Log
util/sockopt: fix forward-declaration of Log

We need a proper typedef-forward-declaration, rather than just the
struct. Fix it.

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@gmail.com>

bus1/dbus-broker