ath9k: Scrub beacon.c

Remove useless comments, fix indentation.
Also, remove all occurrences of ASSERT(vif) which are not needed.

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 48beef9..94297b6 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -1374,7 +1374,7 @@
 	spin_lock_init(&sc->sc_resetlock);
 	mutex_init(&sc->mutex);
 	tasklet_init(&sc->intr_tq, ath9k_tasklet, (unsigned long)sc);
-	tasklet_init(&sc->bcon_tasklet, ath9k_beacon_tasklet,
+	tasklet_init(&sc->bcon_tasklet, ath_beacon_tasklet,
 		     (unsigned long)sc);
 
 	/*