rtnetlink & bonding: change args got get_tx_queues

Change get_tx_queues, drop unsused arg/return value real_tx_queues,
and use return by value (with error) rather than call by reference.

Probably bonding should just change to LLTX and the whole get_tx_queues
API could disappear!

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 62d2409..53ee6a0 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4820,12 +4820,9 @@
 	return 0;
 }
 
-static int bond_get_tx_queues(struct net *net, struct nlattr *tb[],
-			      unsigned int *num_queues,
-			      unsigned int *real_num_queues)
+static int bond_get_tx_queues(struct net *net, const struct nlattr *tb[])
 {
-	*num_queues = tx_queues;
-	return 0;
+	return tx_queues;
 }
 
 static struct rtnl_link_ops bond_link_ops __read_mostly = {