net/mlx5: Release tunnel device after tc update skb

The cited commit causes a regression. Tunnel device is not released
after tc update skb if skb needs to be freed. The following error
message will be printed:

  unregister_netdevice: waiting for vxlan1 to become free. Usage count = 11

Fix it by releasing tunnel device if skb needs to be freed.

Fixes: 93a1ab2c ("net/mlx5: Refactor tc miss handling to a single function")
Signed-off-by: Chris Mi <cmi@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

@@ -715,5 +715,6 @@ void mlx5e_rep_tc_receive(struct mlx5_cqe64 *cqe, struct mlx5e_rq *rq,
 	return;
 
 free_skb:
+	dev_put(tc_priv.fwd_dev);
 	dev_kfree_skb_any(skb);
 }