mt76: intialize tx queue entry wcid to 0xffff by default

Avoid accidentally mapping them to WCID 0 on completion
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/dma.c

@@ -191,6 +191,7 @@ mt76_dma_add_buf(struct mt76_dev *dev, struct mt76_queue *q,
 
 	q->entry[idx].txwi = txwi;
 	q->entry[idx].skb = skb;
+	q->entry[idx].wcid = 0xffff;
 
 	return idx;
 }

drivers/net/wireless/mediatek/mt76/sdio.c

@@ -256,6 +256,7 @@ mt76s_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
 
 	q->entry[q->head].skb = tx_info.skb;
 	q->entry[q->head].buf_sz = len;
+	q->entry[q->head].wcid = 0xffff;
 
 	smp_wmb();
 

drivers/net/wireless/mediatek/mt76/usb.c

@@ -925,6 +925,7 @@ mt76u_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
 
 	q->head = (q->head + 1) % q->ndesc;
 	q->entry[idx].skb = tx_info.skb;
+	q->entry[idx].wcid = 0xffff;
 	q->queued++;
 
 	return idx;