[PATCH] test/crypto: fix return value in RSA test

[Akhil Goyal]

> This patch fixes incorrect return value when RSA negative
> test scenario is validated.
> 
> Coverity-issue: 457463
> Fixes: 9682e8246ae ("test/crypto: add negative case for RSA verification")
> 
> Signed-off-by: Gowrishankar Muthukrishnan <gmuthukrishn at marvell.com>
Acked-by: Akhil Goyal <gakhil at marvell.com>

Applied to dpdk-next-crypto
Thanks.