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/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 8bd3c9f..c9be090 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -2863,7 +2863,7 @@
 			em_num = 0;
 		}
 
-		if (dev->mc_count == 0)
+		if (netdev_mc_empty(dev))
 			return;
 
 		/* Parse the list, and set the appropriate bits */