mt76: mt7915: fix mt7915_mcu_add_beacon

ieee80211_beacon_get_template() returns NULL when beacon state is disabled.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -2451,6 +2451,17 @@ int mt7915_mcu_add_beacon(struct ieee80211_hw *hw,
 	struct bss_info_bcn *bcn;
 	int len = MT7915_BEACON_UPDATE_SIZE + MAX_BEACON_SIZE;
 
+	rskb = mt7915_mcu_alloc_sta_req(dev, mvif, NULL, len);
+	if (IS_ERR(rskb))
+		return PTR_ERR(rskb);
+
+	tlv = mt7915_mcu_add_tlv(rskb, BSS_INFO_OFFLOAD, sizeof(*bcn));
+	bcn = (struct bss_info_bcn *)tlv;
+	bcn->enable = en;
+
+	if (!en)
+		goto out;
+
 	skb = ieee80211_beacon_get_template(hw, vif, &offs);
 	if (!skb)
 		return -EINVAL;
@@ -2461,16 +2472,6 @@ int mt7915_mcu_add_beacon(struct ieee80211_hw *hw,
 		return -EINVAL;
 	}
 
-	rskb = mt7915_mcu_alloc_sta_req(dev, mvif, NULL, len);
-	if (IS_ERR(rskb)) {
-		dev_kfree_skb(skb);
-		return PTR_ERR(rskb);
-	}
-
-	tlv = mt7915_mcu_add_tlv(rskb, BSS_INFO_OFFLOAD, sizeof(*bcn));
-	bcn = (struct bss_info_bcn *)tlv;
-	bcn->enable = en;
-
 	if (mvif->band_idx) {
 		info = IEEE80211_SKB_CB(skb);
 		info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY;
@@ -2481,6 +2482,7 @@ int mt7915_mcu_add_beacon(struct ieee80211_hw *hw,
 	mt7915_mcu_beacon_cont(dev, rskb, skb, bcn, &offs);
 	dev_kfree_skb(skb);
 
+out:
 	return mt76_mcu_skb_send_msg(&phy->dev->mt76, rskb,
 				     MCU_EXT_CMD(BSS_INFO_UPDATE), true);
 }