RE: [EXTERNAL] [v2] examples/fips_validation: fix dangling pointer for SHA and SHAKE test

[Gowrishankar Muthukrishnan]

> Set vector pointer to NULL after free to avoid calling rte_free() on the same
> pointer twice in some cases.
> 
> Signed-off-by: Emma Finn <emma.f...@intel.com>

Acked-by: Gowrishankar Muthukrishnan <gmuthukri...@marvell.com>