mac80211: 80Mhz was not reported properly when using tx_status_ext

When reporting 80MHz, we need to set 4 and not 2 inside the corresponding
field inside the Tx Radiotap header.

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/20190807075949.32414-3-john@phrozen.orgSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/status.c

@@ -403,7 +403,7 @@ ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 			*pos = 11;
 			break;
 		case RATE_INFO_BW_80:
-			*pos = 2;
+			*pos = 4;
 			break;
 		case RATE_INFO_BW_40:
 			*pos = 1;