mac80211: make ieee80211_rx_h_mgmt more readable

That function isn't exactly easy to read especially since it
does something in an if branch that continues after the if
because the else returns. Express it in a more readable way.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc net/mac80211/rx.c
Simple merge