Fix to return a negative error code in the add bond vlan ids error
handling case instead of 0, as done elsewhere in this function.
Introduced by commit 
1ff412ad7714f6952f76ffd77f0a7f2f563288a1.
(bonding: change the bond's vlan syncing functions with the standard ones)
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
                dev_mc_add(slave_dev, lacpdu_multicast);
        }
 
-       if (vlan_vids_add_by_dev(slave_dev, bond_dev)) {
+       res = vlan_vids_add_by_dev(slave_dev, bond_dev);
+       if (res) {
                pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
                       bond_dev->name, slave_dev->name);
                goto err_close;