bonding:delete a dereference before check

Dan Carpenter found that there was a dereference before a check,
added in 56d00c67(bonding:delete lacp_fast from ad_bond_info).
Signed-off-by: Weiping Pan <panweiping3@gmail.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@conan.davemloft.net>

drivers/net/bonding/bond_3ad.c

@@ -1900,7 +1900,6 @@ void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
 int bond_3ad_bind_slave(struct slave *slave)
 {
 	struct bonding *bond = bond_get_bond_by_slave(slave);
-	int lacp_fast = bond->params.lacp_fast;
 	struct port *port;
 	struct aggregator *aggregator;
 
@@ -1916,7 +1915,7 @@ int bond_3ad_bind_slave(struct slave *slave)
 		// port initialization
 		port = &(SLAVE_AD_INFO(slave).port);
 
-		ad_initialize_port(port, lacp_fast);
+		ad_initialize_port(port, bond->params.lacp_fast);
 
 		port->slave = slave;
 		port->actor_port_number = SLAVE_AD_INFO(slave).id;