net: fec: fix code identation

There have extra identation before .skb_copy_to_linear_data_offset(),
this patch just remove the identation.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NFugang Duan <B38611@freescale.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>