bonding: fail_over_mac should only affect AB mode in bond_set_mac_address()

The fail_over_mac could be set to active or follow in any time for every mode, so if the fail_over_mac is not none when the mode is not in active-backup, the bond_set_moc_address() could not change the master and slave's MAC address.

In bond_set_mac_address(), the fail_over_mac should only affect AB mode, so modify to check the mode in addition to fail_over_mac when setting bond's MAC address.

---
 drivers/net/bonding/bond_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index 4409aa8..4a79585 100644
@@ -3423,7 +3423,8 @@ static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
 	/* If fail_over_mac is enabled, do nothing and return success.
 	 * Returning an error causes ifenslave to fail.
 	 */
-	if (bond->params.fail_over_mac)
+	if (bond->params.fail_over_mac &&
+	    bond->params.mode == BOND_MODE_ACTIVEBACKUP)
 		return 0;
 
 	if (!is_valid_ether_addr(sa->sa_data))

1.8.0