mac80211: fix STA channel width field

According to IEEE 802.11 8.4.2.59, set the "STA channel width" bit to 0
if transmitting STA is using a 20mhz channel.
Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/util.c

@@ -1684,7 +1684,9 @@ u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
 		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
 		break;
 	}
-	if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
+	if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
+	    channel_type != NL80211_CHAN_NO_HT &&
+	    channel_type != NL80211_CHAN_HT20)
 		ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
 
 	/*