mac80211: add HT conf helpers
In HT capable drivers you often need to check if you are currently using HT20 or HT40. This adds a few small helpers to let drivers figure that out. Signed-off-by: NLuis R. Rodriguez <lrodriguez@atheros.com> Acked-by: NJohannes Berg <johannes@sipsolutions.net> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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