If the file name is larger than MAX_STRING_SIZE (64), strcpy()
will overwrite the content of memory.
Replace strcpy() by rte_strscpy(), check its return value, and
increase file_name size to 256.
Fixes: 3d0fad56b74a ("examples/fips_validation: add crypto FIPS application")
Cc: stable@dpdk.org
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>