mac80211: Self-protected management frames are not robust

They may contain encrypted information elements (as AMPE frames do)
but they are not encrypted.

Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/linux/ieee80211.h

@@ -1520,6 +1520,7 @@ static inline bool ieee80211_is_robust_mgmt_frame(struct ieee80211_hdr *hdr)
 		category = ((u8 *) hdr) + 24;
 		return *category != WLAN_CATEGORY_PUBLIC &&
 			*category != WLAN_CATEGORY_HT &&
+			*category != WLAN_CATEGORY_SELF_PROTECTED &&
 			*category != WLAN_CATEGORY_VENDOR_SPECIFIC;
 	}