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/rc.c b/drivers/net/wireless/ath9k/rc.c
index 1305873..02931a1 100644
--- a/drivers/net/wireless/ath9k/rc.c
+++ b/drivers/net/wireless/ath9k/rc.c
@@ -816,7 +816,7 @@
 }
 
 u8 ath_rate_findrateix(struct ath_softc *sc,
-			     u8 dot11rate)
+		       u8 dot11rate)
 {
 	const struct ath_rate_table *ratetable;
 	struct ath_rate_softc *rsc = sc->sc_rc;