ath9k: Add debugfs files for printing TX rate details

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/rc.c b/drivers/net/wireless/ath9k/rc.c
index a8c4f97..704b627 100644
--- a/drivers/net/wireless/ath9k/rc.c
+++ b/drivers/net/wireless/ath9k/rc.c
@@ -1544,6 +1544,8 @@
 				ieee80211_start_tx_ba_session(sc->hw, hdr->addr1, tid);
 		}
 	}
+
+	ath_debug_stat_rc(sc, skb);
 exit:
 	kfree(tx_info_priv);
 }