net/mlx5: Fix invalid pointer reference when prof_sel parameter is invalid

When prof_sel is invalid, mlx5_core_warn is called but the
mlx5_core_dev is not initialized yet. Solution is moving the prof_sel code
after dev->pdev assignment

Fixes: 2974ab6e

 ('net/mlx5: Improve driver log messages')
Signed-off-by: Huy Nguyen <huyn@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>