char *ifname;
        int i, res, found, ret = count;
        struct slave *slave;
-       struct net_device *dev = 0;
+       struct net_device *dev = NULL;
        struct bonding *bond = to_bond(cd);
 
        /* Quick sanity check -- is the bond interface up? */
                        printk(KERN_INFO DRV_NAME
                               ": %s: Setting primary slave to None.\n",
                               bond->dev->name);
-                       bond->primary_slave = 0;
+                       bond->primary_slave = NULL;
                                bond_select_active_slave(bond);
                } else {
                        printk(KERN_INFO DRV_NAME
                        printk(KERN_INFO DRV_NAME
                               ": %s: Setting active slave to None.\n",
                               bond->dev->name);
-                       bond->primary_slave = 0;
+                       bond->primary_slave = NULL;
                                bond_select_active_slave(bond);
                } else {
                        printk(KERN_INFO DRV_NAME