-in our current model, a kif has either a pointer to an interface (ifnet) or

a group, or there cannot be addresses associated with it. so we can get rid
of checking kifs in the 3rd case and just be done with it.
-we don't need to try to manually clear the table used for the (interface)
notation when both the ifp and the group pointers are NULL, the pfr_set_addrs
call will do the right thing with an empty set of addrs
suggested by cedric, ryan ok

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