bonding: cleanup and remove dead code

fix sparse warning about non-static function

drivers/net/bonding/bond_main.c:3737:5: warning: symbol
'bond_3ad_xor_xmit' was not declared. Should it be static?

Reviewed-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: Jonathan Toppins <jtoppins@cumulusnetworks.com>
Signed-off-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -3734,7 +3734,7 @@ out:
  * usable slave array is formed in the control path. The xmit function
  * just calculates hash and sends the packet out.
  */
-int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
+static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct bonding *bond = netdev_priv(dev);
 	struct slave *slave;