bonding: create a macro for bond mode and use it

CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_sysfs_slave.c b/drivers/net/bonding/bond_sysfs_slave.c
index 89bc3b3..198677f 100644
--- a/drivers/net/bonding/bond_sysfs_slave.c
+++ b/drivers/net/bonding/bond_sysfs_slave.c
@@ -69,7 +69,7 @@
 {
 	const struct aggregator *agg;
 
-	if (slave->bond->params.mode == BOND_MODE_8023AD) {
+	if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) {
 		agg = SLAVE_AD_INFO(slave)->port.aggregator;
 		if (agg)
 			return sprintf(buf, "%d\n",