net: use helpers to access uc list V2

This patch introduces three macros to work with uc list from net drivers.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index 4fad9db..2cba5c5 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3665,10 +3665,10 @@
 		/* Unicast addresses changes may only happen under the rtnl,
 		 * therefore calling __dev_set_promiscuity here is safe.
 		 */
-		if (dev->uc.count > 0 && !dev->uc_promisc) {
+		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
 			__dev_set_promiscuity(dev, 1);
 			dev->uc_promisc = 1;
-		} else if (dev->uc.count == 0 && dev->uc_promisc) {
+		} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
 			__dev_set_promiscuity(dev, -1);
 			dev->uc_promisc = 0;
 		}