When IFF_MULTICAST was not enabled on the vap, we used to skip some filtering that...

When IFF_MULTICAST was not enabled on the vap, we used to skip some filtering that prevents reception of your own multicast traffic.  Then we would procede to ignore the fact that IFF_MULTICAST flag was disabled and send anyway.

I've fixed the logic so that multicast is dropped, with an error when disabled.  I don't think this is a valid configuration.  Also, we don't skip the filtering logic so that our own multicast traffic doesn't come back to us (looking like a bridging loop).

git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3132 0192ed92-7a03-0410-a25b-9323aeb14dbd