test/event_crypto: fix to avail mempool entries
test/event_crypto: fix to avail mempool entries

Added the missed code to avail the mempool entries before
pool free.

Fixes: 24054e3640a2 ("test/crypto: use separate session mempools")
Cc: stable@dpdk.org

Signed-off-by: Hemant Agrawal <90d96ef1ecd8ed49b97c7897be950e80824a9c5c@nxp.com>
Acked-by: Abhinandan Gujjar <29ad062ba1cd829579f256025feb80cd7487d6f7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk