Peter Wemm f0448ae4a2 Fix panic("ifpromisc failed") when shutting down a bpf tap when the attached
interface is no longer IFF_UP.
The test for IFF_UP in ifpromisc is only useful while enabling IFF_PROMISC
and the higher levels of the bpf code do not allow for the possibility of
failure while shutting down.  This is a trivial change.
Also, fixes PR#522.
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