the NIC decryptes & decapsulates WEP frames before passing them to
the host. "Remember" the state of IEEE80211_F_DROPUNENC in
sc_ic_flags, though, and try our best to honor it as we setup the
hardware state.
This is the second patch of this kind. The previous patch was
badly broken because wi_mend_flags was basing its decision to clear
IEEE80211_F_DROPUNENC based on the operating state we were
transitioning FROM instead of the state we were transitioning TO.
This fixes a bug that Simon Burge reported, where dhclient wi0
would not get a lease unless and until you ran 'ifconfig wi0'
concurrently (which would frob the IEEE80211_F_DROPUNENC bit in
the right way). This patch was tested by Simon with his Toshiba
Lucent-clone.
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