nl80211: use the new genetlink pre/post_doit hooks
This makes nl80211 use the new genetlink pre_doit/post_doit hooks for locking and checking the interface/wiphy index. This significantly reduces the code size and the likelihood of locking errors. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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