[BRIDGE]: generate kobject remove event

The earlier round of kobject/sysfs changes to bridge caused
it not to generate a uevent on removal. Don't think any application
cares (not sure about Xen) but since it generates add uevent
it should generate remove as well.
Signed-off-by: Stephen Hemminger <shemmigner@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_if.c

@@ -169,6 +169,7 @@ static void del_nbp(struct net_bridge_port *p)
 
 	rcu_assign_pointer(dev->br_port, NULL);
 
+	kobject_uevent(&p->kobj, KOBJ_REMOVE);
 	kobject_del(&p->kobj);
 
 	call_rcu(&p->rcu, destroy_nbp_rcu);