iwlagn: support dynamic aggregation for BT coex

Use dynamic aggregation threshold if bt traffic load is high
to reduce the impact on aggregated frame.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index 8fdd4ef..4876e26 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -1580,7 +1580,7 @@
 		priv->bt_full_concurrent ? "full concurrency" : "3-wire");
 	pos += scnprintf(buf + pos, bufsz - pos, "BT status: %s, "
 			 "last traffic notif: %d\n",
-		priv->bt_status ? "On" : "Off", priv->notif_bt_traffic_load);
+		priv->bt_status ? "On" : "Off", priv->last_bt_traffic_load);
 	pos += scnprintf(buf + pos, bufsz - pos, "ch_announcement: %d, "
 			 "sco_active: %d, kill_ack_mask: %x, "
 			 "kill_cts_mask: %x\n",