enic: Fix addr valid check in enic_set_vf_mac

zero mac address is a valid address for VIC dynamic vnic and sriov Vf's.
Fix the check in enic_set_vf_mac appropriately

Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: Christian Benvenuti <benve@cisco.com>
Signed-off-by: Sujith Sankar <ssujith@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index 9080ed6..77b4e87 100644
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -1069,7 +1069,7 @@
 	if (err)
 		return err;
 
-	if (is_valid_ether_addr(mac)) {
+	if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
 		if (vf == PORT_SELF_VF) {
 			memcpy(pp->vf_mac, mac, ETH_ALEN);
 			return 0;