netdevsim: fib: Do not warn if route was not found for several events

The next patch will add the ability to fail route offload controlled by
debugfs variable called "fail_route_offload".

If we vetoed the addition, we might get a delete or append notification
for a route we do not have. Therefore, do not warn if route was not found.

Signed-off-by: Amit Cohen <[e-mail]>
Signed-off-by: Ido Schimmel <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/netdevsim/fib.c

···
 	struct nsim_fib4_rt *fib4_rt;
 
 	fib4_rt = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info);
-	if (WARN_ON_ONCE(!fib4_rt))
+	if (!fib4_rt)
 		return;
 
 	rhashtable_remove_fast(&data->fib_rt_ht, &fib4_rt->common.ht_node,
···
 	struct nsim_fib6_rt_nh *fib6_rt_nh;
 
 	fib6_rt_nh = nsim_fib6_rt_nh_find(fib6_rt, rt);
-	if (WARN_ON_ONCE(!fib6_rt_nh))
+	if (!fib6_rt_nh)
 		return;
 
 	fib6_rt->nhs--;
···
 	int i, err;
 
 	fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, rt);
-	if (WARN_ON_ONCE(!fib6_rt))
+	if (!fib6_rt)
 		return -EINVAL;
 
 	for (i = 0; i < fib6_event->nrt6; i++) {