mac80211: fix comment referring to RX queue

There are no RX queues in mac80211 (yet), the comment should refer
to the TID (including one slot for non-QoS) rather than 'RX queue'.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/sta_info.h

@@ -317,7 +317,8 @@ struct ieee80211_fast_tx {
  * @last_signal: signal of last received frame from this STA
  * @avg_signal: moving average of signal of received frames from this STA
  * @last_ack_signal: signal of last received Ack frame from this STA
- * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
+ * @last_seq_ctrl: last received seq/frag number from this STA (per TID
+ *	plus one for non-QoS frames)
  * @tx_filtered_count: number of frames the hardware filtered for this STA
  * @tx_retry_failed: number of frames that failed retry
  * @tx_retry_count: total number of retries for frames to this STA