app/crypto-perf: fix out-of-bounds array access
app/crypto-perf: fix out-of-bounds array access

Fixes: 27c2e7471961 ("app/crypto-perf: support IMIX")

Signed-off-by: Fan Zhang <b46d470dc79aa6fd718cd24d07380f6203b7fc3c@intel.com>

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