ipv4: Add lockdep condition to fix for_each_entry()

This commit applies the consolidated list_for_each_entry_rcu() support
for lockdep conditions.
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NJoel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: NPaul E. McKenney <paulmck@linux.ibm.com>

net/ipv4/fib_frontend.c

@@ -124,7 +124,8 @@ struct fib_table *fib_get_table(struct net *net, u32 id)
 	h = id & (FIB_TABLE_HASHSZ - 1);
 
 	head = &net->ipv4.fib_table_hash[h];
-	hlist_for_each_entry_rcu(tb, head, tb_hlist) {
+	hlist_for_each_entry_rcu(tb, head, tb_hlist,
+				 lockdep_rtnl_is_held()) {
 		if (tb->tb_id == id)
 			return tb;
 	}