net: rswitch: Fix missing dev_kfree_skb_any() in error path

Before returning the rswitch_start_xmit() in the error path,
dev_kfree_skb_any() should be called. So, fix it.

Fixes: 33f5d733 ("net: renesas: rswitch: Improve TX timestamp accuracy")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/rswitch.c

@@ -1517,10 +1517,8 @@ static netdev_tx_t rswitch_start_xmit(struct sk_buff *skb, struct net_device *nd
 		return ret;
 
 	dma_addr = dma_map_single(ndev->dev.parent, skb->data, skb->len, DMA_TO_DEVICE);
-	if (dma_mapping_error(ndev->dev.parent, dma_addr)) {
-		dev_kfree_skb_any(skb);
-		return ret;
-	}
+	if (dma_mapping_error(ndev->dev.parent, dma_addr))
+		goto err_kfree;
 
 	gq->skbs[gq->cur] = skb;
 	desc = &gq->tx_ring[gq->cur];
@@ -1533,10 +1531,8 @@ static netdev_tx_t rswitch_start_xmit(struct sk_buff *skb, struct net_device *nd
 		struct rswitch_gwca_ts_info *ts_info;
 
 		ts_info = kzalloc(sizeof(*ts_info), GFP_ATOMIC);
-		if (!ts_info) {
-			dma_unmap_single(ndev->dev.parent, dma_addr, skb->len, DMA_TO_DEVICE);
-			return ret;
-		}
+		if (!ts_info)
+			goto err_unmap;
 
 		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
 		rdev->ts_tag++;
@@ -1558,6 +1554,14 @@ static netdev_tx_t rswitch_start_xmit(struct sk_buff *skb, struct net_device *nd
 	gq->cur = rswitch_next_queue_index(gq, true, 1);
 	rswitch_modify(rdev->addr, GWTRC(gq->index), 0, BIT(gq->index % 32));
 
+	return ret;
+
+err_unmap:
+	dma_unmap_single(ndev->dev.parent, dma_addr, skb->len, DMA_TO_DEVICE);
+
+err_kfree:
+	dev_kfree_skb_any(skb);
+
 	return ret;
 }