This patch changes 'only_once' variable to 'display_once',
which should be atomic type due to fact, that all runner functions
can be executed in paraller way on different lcores.
Fixes: df52cb3b6e13 ("app/crypto-perf: move verify as single test type")
Cc: stable@dpdk.org
Signed-off-by: Tomasz Jozwiak <tjozwiakgm@gmail.com>
Acked-by: Akhil Goyal <akhil.goyal@nxp.com>