net: ethernet: rtsn: fix potential memory leak in rtsn_start_xmit()

The rtsn_start_xmit() returns NETDEV_TX_OK without freeing skb
in case of skb->len being too long, add dev_kfree_skb_any() to fix it.

Fixes: b0d3969 ("net: ethernet: rtsn: Add support for Renesas Ethernet-TSN")
Signed-off-by: Wang Hai <[email protected]>
Reviewed-by: Niklas Söderlund <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Wang Hai

drivers/net/ethernet/renesas/rtsn.c

@@ -1057,6 +1057,7 @@ static netdev_tx_t rtsn_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	if (skb->len >= TX_DS) {
 		priv->stats.tx_dropped++;
 		priv->stats.tx_errors++;
+		dev_kfree_skb_any(skb);
 		goto out;
 	}