Use eth_zero_addr() to clear mac address insetad of memset().

Link: https://lore.kernel.org/r/1595234344-13955-1-git-send-email-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>