net: fib_rules: mark arguments to fib_rules_register const and __net_initdata

fib_rules_register() duplicates the template passed to it without modification,
mark the argument as const. Additionally the templates are only needed when
instantiating a new namespace, so mark them as __net_initdata, which means
they can be discarded when CONFIG_NET_NS=n.

Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 1bc6659..42e84e0 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -122,7 +122,7 @@
 }
 
 struct fib_rules_ops *
-fib_rules_register(struct fib_rules_ops *tmpl, struct net *net)
+fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
 {
 	struct fib_rules_ops *ops;
 	int err;