netdev: make address const in device address management

The internal functions for add/deleting addresses don't change
their argument.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index f507d2a..11a984b 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -363,10 +363,10 @@
 
 extern int br_fdb_delete(struct ndmsg *ndm,
 			 struct net_device *dev,
-			 unsigned char *addr);
+			 const unsigned char *addr);
 extern int br_fdb_add(struct ndmsg *nlh,
 		      struct net_device *dev,
-		      unsigned char *addr,
+		      const unsigned char *addr,
 		      u16 nlh_flags);
 extern int br_fdb_dump(struct sk_buff *skb,
 		       struct netlink_callback *cb,