net/mlx5e: TC, Remove redundant WARN_ON()

The case where the packet is not offloaded and needs to be restored
to slow path and couldn't find expected tunnel information should not
dump a call trace to the user. there is a debug call.
Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c

@@ -690,7 +690,6 @@ static bool mlx5e_restore_tunnel(struct mlx5e_priv *priv, struct sk_buff *skb,
 
 	err = mapping_find(uplink_priv->tunnel_mapping, tun_id, &key);
 	if (err) {
-		WARN_ON_ONCE(true);
 		netdev_dbg(priv->netdev,
 			   "Couldn't find tunnel for tun_id: %d, err: %d\n",
 			   tun_id, err);