mac80211: fix bad guard when reporting legacy rates

When reporting legacy rates inside the TX Radiotap header we need to split
the check between "uses tx_statua_ext" and "is legacy rate". Not doing so
would make the code drop into the !tx_status_ext path.

Fixes: 3d07ffca ("mac80211: add struct ieee80211_tx_status support to ieee80211_add_tx_radiotap_header")
Signed-off-by: John Crispin <john@phrozen.org>
Link: https://lore.kernel.org/r/20190807075949.32414-2-john@phrozen.orgSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/status.c

@@ -327,13 +327,13 @@ ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 
 	/* IEEE80211_RADIOTAP_RATE */
 
-	if (status && status->rate && !(status->rate->flags &
-					(RATE_INFO_FLAGS_MCS |
+	if (status && status->rate) {
+		if (!(status->rate->flags & (RATE_INFO_FLAGS_MCS |
 					     RATE_INFO_FLAGS_60G |
 					     RATE_INFO_FLAGS_VHT_MCS |
 					     RATE_INFO_FLAGS_HE_MCS)))
 			legacy_rate = status->rate->legacy;
-	else if (info->status.rates[0].idx >= 0 &&
+	} else if (info->status.rates[0].idx >= 0 &&
 		 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 						  IEEE80211_TX_RC_VHT_MCS)))
 		legacy_rate =