ath9k: implement .tx_last_beacon()

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index b070f40..f75068b 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -397,6 +397,9 @@
 	struct ath_descdma bdma;
 	struct ath_txq *cabq;
 	struct list_head bbuf;
+
+	bool tx_processed;
+	bool tx_last;
 };
 
 void ath_beacon_tasklet(unsigned long data);