net/mlx5_core: Fix async commands return code

In case of async command completion, the error code returned should take
into account the command completion status.
Signed-off-by: NEli Cohen <eli@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/cmd.c

@@ -1136,6 +1136,7 @@ void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, unsigned long vector)
 				mlx5_free_cmd_msg(dev, ent->out);
 				free_msg(dev, ent->in);
 
+				err = err ? err : ent->status;
 				free_cmd(ent);
 				callback(err, context);
 			} else {