net/mlx5: Fix driver load bad flow when having fw initializing timeout

If FW is stuck in initializing state we will skip the driver load, but
current error handling flow doesn't clean previously allocated command
interface resources.

Fixes: e3297246 ('net/mlx5_core: Wait for FW readiness on startup')
Signed-off-by: Mohamad Haj Yahia <mohamad@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>