OK kn with guenther's suggestions in.
- multicast.4: drop unneeded (void *) casts scottcheloha
- Re: multicast.4: drop unneeded (void *) casts Philip Guenther
- Re: multicast.4: drop unneeded (void *) casts Klemens Nanni
- Re: multicast.4: drop unneeded (void *) casts Scott Cheloha
- Re: multicast.4: drop unneeded (void *) casts Philip Guenther
