ath9k: Ensure ath_node is not NULL when updating tx chainmask

Also, random indentation and whitespace cleanup.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 839db231..0a0eb7c 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -489,8 +489,7 @@
 	return 0;
 }
 
-int ath_rx_subframe(struct ath_node *an,
-		    struct sk_buff *skb,
+int ath_rx_subframe(struct ath_node *an, struct sk_buff *skb,
 		    struct ath_recv_status *status)
 {
 	struct ath_softc *sc = an->an_sc;