cxgbe(4):  Verify that the addresses in if_multiaddrs really are multicast
addresses.  (The chip doesn't really care, it's just that it needs to be
told explicitly if unicast DMACs are checked for "hits" in the hash that
is used after the TCAM entries are all used up).


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272051 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f