nfp: flower: free dst_entry in route table

We need to release the refcnt on dst_entry in the route table, otherwise
we will leak the route.

Fixes: 8e6a9046 ("nfp: flower vxlan neighbour offload")
Signed-off-by: NPieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Signed-off-by: NLouis Peens <louis.peens@netronome.com>
Reviewed-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c

@@ -381,6 +381,8 @@ nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
 	err = PTR_ERR_OR_ZERO(rt);
 	if (err)
 		return NOTIFY_DONE;
+
+	ip_rt_put(rt);
 #else
 	return NOTIFY_DONE;
 #endif