net: use netdev_mc_count and netdev_mc_empty when appropriate

This patch replaces dev->mc_count in all drivers (hopefully I didn't miss
anything). Used spatch and did small tweaks and conding style changes when
it was suitable.

Jirka

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 ae75f25..d1cf53d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4263,7 +4263,7 @@
 	netif_addr_lock_bh(dev);
 
 	__dev_addr_discard(&dev->mc_list);
-	dev->mc_count = 0;
+	netdev_mc_count(dev) = 0;
 
 	netif_addr_unlock_bh(dev);
 }