[EXT] [PATCH] app/crypto-perf: fix test file memory leak

[Akhil Goyal]

> A memory leak was detected using the AddressSanitizer tool,
> when running the crypto-perf application with a test vector file.
> 
> The strdup function used returns a pointer to a null-terminated byte
> string, which must be freed after use. This patch frees the pointer in
> an error case, and also after a successful run.
> 
> Fixes: f8be1786b1b8 ("app/crypto-perf: introduce performance test
> application")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Ciara Power <ciara.power at intel.com>
Acked-by: Akhil Goyal <gakhil at marvell.com>

Applied to dpdk-next-crypto