ixgbe: clear mac address data block in DCB mode

This change clears the address data block memory space, which is needed for
the 82598 which does not have a SAN MAC.

Signed-off-by: Lucy Liu <lucy.liu@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe_dcb_nl.c

@@ -175,6 +175,8 @@ static void ixgbe_dcbnl_get_perm_hw_addr(struct net_device *netdev,
 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
 	int i, j;
 
+	memset(perm_addr, 0xff, MAX_ADDR_LEN);
+
 	for (i = 0; i < netdev->addr_len; i++)
 		perm_addr[i] = adapter->hw.mac.perm_addr[i];