widget-resolver: unref listener pool before aborting the resolver
widget-resolver: unref listener pool before aborting the resolver

After the listener has been removed from the linked list, the pointer
is not needed anymore.

CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy