iwlwifi: mvm: fix dqa deferred frames marking

When a STA has deferred traffic to TX, an appropriate bit
is turned on in %deferred_tx_frames to indicate deferred
traffic. This marking is never turned off, resulting in
iterating over TIDs with no deferred traffic.

Although this didn't cause any failures/errors/bugs, there
is still no point of iterating over these TIDs when not
needed.
Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/sta.c

@@ -1015,6 +1015,7 @@ static void iwl_mvm_tx_deferred_stream(struct iwl_mvm *mvm,
 	local_bh_disable();
 	spin_lock(&mvmsta->lock);
 	skb_queue_splice_init(&tid_data->deferred_tx_frames, &deferred_tx);
+	mvmsta->deferred_traffic_tid_map &= ~BIT(tid);
 	spin_unlock(&mvmsta->lock);
 
 	while ((skb = __skb_dequeue(&deferred_tx)))