[PATCH] net/mlx5: fix CQEs dumping for Tx

[Matan Azrad]

From: Alexander Kozyrev
> The regular CQE size can be 64 bytes or 128 bytes depending on the cache
> line size. The error CQE is always 64 bytes long.
> Only 64 bytes are dumped to the log file in case of Tx queue recovery form
> the error. Use the CQE size, not the error CQE size.
> 
> Fixes: 957e45fb7b ("net/mlx5: handle Tx completion with error")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Alexander Kozyrev <akozyrev at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>