main.go: flag help message error fix
main.go: flag help message error fix

Signed-off-by: ethan <2dca52765acf93a024077590b100d00c3300ed67@daocloud.io>
nalind/cri-o,kubernetes-incubator/cri-o,mikebrow/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,mikebrow/cri-o,nalind/cri-o,mikebrow/cri-o,nalind/cri-o,kubernetes-incubator/cri-o,mikebrow/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/ocid