ath9k: remove a bogus error message

When beacons are being added or removed for an interface, ieee80211_beacon_get
will sometimes not return a beacon. This is normal and should not result in
useless logspam.

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/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index 8de591e..ab8c05c 100644
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -279,10 +279,8 @@
 
 	/* NB: the beacon data buffer must be 32-bit aligned. */
 	skb = ieee80211_beacon_get(sc->hw, vif);
-	if (skb == NULL) {
-		ath_err(common, "ieee80211_beacon_get failed\n");
+	if (skb == NULL)
 		return -ENOMEM;
-	}
 
 	tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
 	sc->beacon.bc_tstamp = le64_to_cpu(tstamp);