[PATCH v1] examples/fips_validation: fix print for zero length payload

[Akhil Goyal]

> Subject: [PATCH v1] examples/fips_validation: fix print for zero length payload
> 
> NIST GCM decrypt result vectors expects to have following print
> for zero length payload instead of having no print.
> "pt" = ""
> 
> Fixes: b09aac2d6e2b ("examples/fips_validation: add JSON to GCM test")
> 
> Signed-off-by: Archana Muniganti <marchana at marvell.com>
Applied to dpdk-next-crypto

Thanks.