net: fec: fix code identation

There have extra identation before .skb_copy_to_linear_data_offset(),
this patch just remove the identation.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>