[PATCH net] ravb: Double free on error in ravb_start_xmit()

[Dan Carpenter]

If skb_put_padto() fails then it frees the skb.  I shifted that code
up a bit to make my error handling a little simpler.

Fixes: a0d2f20650e8 ("Renesas Ethernet AVB PTP clock driver")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/net/ethernet/renesas/ravb_main.c 
b/drivers/net/ethernet/renesas/ravb_main.c
index 8cfc4a54f2dc..3cd7989c007d 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1516,11 +1516,12 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, 
struct net_device *ndev)
                spin_unlock_irqrestore(&priv->lock, flags);
                return NETDEV_TX_BUSY;
        }
-       entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * NUM_TX_DESC);
-       priv->tx_skb[q][entry / NUM_TX_DESC] = skb;
 
        if (skb_put_padto(skb, ETH_ZLEN))
-               goto drop;
+               goto exit;
+
+       entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * NUM_TX_DESC);
+       priv->tx_skb[q][entry / NUM_TX_DESC] = skb;
 
        buffer = PTR_ALIGN(priv->tx_align[q], DPTR_ALIGN) +
                 entry / NUM_TX_DESC * DPTR_ALIGN;