fib6: install fib6 ops in the last step

We should not commit the new ops until we finish
all the setup, otherwise we have to NULL it on failure.
Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/fib6_rules.c

@@ -299,19 +299,16 @@ static int __net_init fib6_rules_net_init(struct net *net)
 	ops = fib_rules_register(&fib6_rules_ops_template, net);
 	if (IS_ERR(ops))
 		return PTR_ERR(ops);
-	net->ipv6.fib6_rules_ops = ops;
-
 
-	err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
-				   RT6_TABLE_LOCAL, 0);
+	err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
 	if (err)
 		goto out_fib6_rules_ops;
 
-	err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
-				   0x7FFE, RT6_TABLE_MAIN, 0);
+	err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
 	if (err)
 		goto out_fib6_rules_ops;
 
+	net->ipv6.fib6_rules_ops = ops;
 out:
 	return err;