1) the setting of NETIF_F_VLAN_CHALLENGED in bond_del_vlan() is
useless since commit 
b2a103e6 because bond_fix_features() now
sets NETIF_F_VLAN_CHALLENGED whenever the last slave is being
removed.
2) the code never triggers anyway as vlan_list is never empty
since 
ad1afb00.
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 
                        kfree(vlan);
 
-                       if (list_empty(&bond->vlan_list) &&
-                           (bond->slave_cnt == 0)) {
-                               /* Last VLAN removed and no slaves, so
-                                * restore block on adding VLANs. This will
-                                * be removed once new slaves that are not
-                                * VLAN challenged will be added.
-                                */
-                               bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
-                       }
-
                        res = 0;
                        goto out;
                }