mt76: dma: reset q->rx_head on rx reset

Fixes rx of the first frame if a fragmented rx was interrupted by the reset
Signed-off-by: NFelix Fietkau <nbd@nbd.name>

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

@@ -431,6 +431,12 @@ mt76_dma_rx_reset(struct mt76_dev *dev, enum mt76_rxq_id qid)
 	mt76_dma_rx_cleanup(dev, q);
 	mt76_dma_sync_idx(dev, q);
 	mt76_dma_rx_fill(dev, q);
+
+	if (!q->rx_head)
+		return;
+
+	dev_kfree_skb(q->rx_head);
+	q->rx_head = NULL;
 }
 
 static void