net/mlx4_en: Use local var for skb_headlen(skb)

Access skb_headlen() once in tx flow

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed