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hostapd & mac80211: too many probe responses

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Hi,

I've just noticed that hostapd + mac80211 + rt2x00 produces way too many
probe responses when setup as multi bssid AP.

The reason seems to be that mac80211 receives a broadcast probe req and
drops it to the monitor interface for each vif (hence X times). And hostapd
will process each received broadcast probe req on all vifs as well (hence X
times again). Resulting in X*X probe responses instead of just X.

This can eat up quite some airtime as the probe reponses are sent at 1Mpbs.

IMO to fix this issue mac80211 should send a broadcast probe req only once
to the monitor interface. However, I don't have a good idea how to do that
right now :)

Thanks,
Helmut
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