atm: slight optimization of addr compare

Use possibly more efficient ether_addr_equal
instead of memcmp.

Cc: Chas Williams <chas@cmf.nrl.navy.mil>
Cc: linux-atm-general@lists.sourceforge.net
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/atm/nicstar.c

@@ -52,6 +52,7 @@
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <linux/atomic.h>
+#include <linux/etherdevice.h>
 #include "nicstar.h"
 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
 #include "suni.h"
@@ -781,8 +782,7 @@ static int ns_init_card(int i, struct pci_dev *pcidev)
 	if (mac[i] == NULL || !mac_pton(mac[i], card->atmdev->esi)) {
 		nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
 				   card->atmdev->esi, 6);
-		if (memcmp(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00", 6) ==
-		    0) {
+		if (ether_addr_equal(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00")) {
 			nicstar_read_eprom(card->membase,
 					   NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
 					   card->atmdev->esi, 6);