mac80211: prevent spurious HT/VHT downgrade message

Even when connecting to an AP that doesn't support VHT,
and even when the local device doesn't support it either,
the downgrade message gets printed. Suppress the message
if HT and/or VHT is disabled.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

net/mac80211/mlme.c

@@ -357,6 +357,10 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 	ret = 0;
 
 out:
+	/* don't print the message below for VHT mismatch if VHT is disabled */
+	if (ret & IEEE80211_STA_DISABLE_VHT)
+		vht_chandef = *chandef;
+
 	while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 					IEEE80211_CHAN_DISABLED)) {
 		if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {