iwlwifi: report error when detect failure during stop agg queue

This fix related to bug 1921 at
http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1921

when detect error during stopping tx aggregation queue, report the error to
help identify the problem.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index 9e83ee2..b13862a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -1223,8 +1223,10 @@
 
 	sta_id = iwl_find_station(priv, ra);
 
-	if (sta_id == IWL_INVALID_STATION)
+	if (sta_id == IWL_INVALID_STATION) {
+		IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
 		return -ENXIO;
+	}
 
 	if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_ON)
 		IWL_WARN(priv, "Stopping AGG while state not IWL_AGG_ON\n");