net/mlx5: fix vectorized Rx burst error handling

net/mlx5: fix vectorized Rx burst error handling

In the process of recovery from error CQE, when using vectorized Rx
burst, the initialization of data length in mbufs was not done.
As a result the wrong length was left written in mbuf, causing
memory overwrite or wrong error report.

This patch fixes the initialization of mbuf data length during
recovery from error CQE, when using vectorized Rx burst,

Fixes: 88c0733535d6 ("net/mlx5: extend Rx completion with error handling")
Cc: stable@dpdk.org
Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>