cryptodev: fix freeing after device release

cryptodev: fix freeing after device release

The PMD destroy function was calling the release function, which frees
cryptodev->data, and then tries to free cryptodev->data->dev_private,
which causes the heap use after free issue.

A temporary pointer is set before the free of cryptodev->data,
which can then be used afterwards to free dev_private.
The free cannot be moved to before the release function is called,
as dev_private is used in the PMD close function while being released.

Fixes: 9e6edea41805 ("cryptodev: add APIs to assist PMD initialisation")
Cc: stable@dpdk.org
Reported-by: Zhihong Peng <zhihongx.peng@intel.com>
Signed-off-by: Ciara Power <ciara.power@intel.com>
Acked-by: Akhil Goyal <gakhil@marvell.com>