checkMandatory: fix map check
checkMandatory: fix map check

Signed-off-by: Ma Shimiao <4511f16e942ad3568742865d09c9060c1d8bebb9@cn.fujitsu.com>

wking/ocitools-v2,liangchenye/ocitools,hmeng-19/ocitools,wking/ocitools-v2,hmeng-19/ocitools,opencontainers/ocitools,opencontainers/runtime-tools,opencontainers/ocitools,liangchenye/ocitools,opencontainers/runtime-tools