net/mlx5: Add forgotten cleanup calls into mlx5_init_once() error path

There are two cleanup calls missing in mlx5_init_once() error path.
Add them making the error path flow to be the same as
mlx5_cleanup_once().

Fixes: 52ec462e ("net/mlx5: Add reserved-gids support")
Fixes: 7c39afb3

 ("net/mlx5: PTP code migration to driver core section")
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>