[ospfd] ignore loopbacks for received interface validation

[ospfd] ignore loopbacks for received interface validation

2006-03-25 Paul Jakma <paul.jakma@sun.com>

	* ospf_interface.c: (ospf_if_lookup_recv_if) Ignore loopbacks,
	  we can never ever receive packets on those. Should fix
	  case where CARP is run with address in same subnet as real
	  interface. Problem report and diagnosis thanks to:
	  Landon Fuller <landonf@opendarwin.org>.
	  However, ospf_read() still can't deal deterministically with
	  multiple interfaces in same subnet.