refactor: remove redundant code

[SimonCqk]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

Merging #2285 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2285      +/-   ##
==========================================
+ Coverage   66.71%   66.71%   +<.01%     
==========================================
  Files         208      208              
  Lines       16937    16934       -3     
==========================================
- Hits        11299    11298       -1     
  Misses       4270     4270              
+ Partials     1368     1366       -2

Flag	Coverage Δ
#criv1alpha1test	32.63% <0%> (+0.02%)	⬆️
#criv1alpha2test	35.93% <100%> (-0.04%)	⬇️
#integrationtest	39.54% <100%> (+0.04%)	⬆️
#nodee2etest	33.27% <0%> (+0.01%)	⬆️
#unittest	23.75% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pkg/kmutex/kmutex.go	92.18% <100%> (-0.35%)	⬇️
ctrd/container.go	59.76% <0%> (-0.48%)	⬇️
cri/v1alpha2/cri_wrapper.go	61.2% <0%> (ø)	⬆️
cri/v1alpha2/cri.go	66.17% <0%> (ø)	⬆️
daemon/logger/jsonfile/utils.go	73.17% <0%> (+1.62%)	⬆️
daemon/containerio/cri_log_file.go	88.23% <0%> (+3.92%)	⬆️

[pouchrobot]

@SimonCqk Thanks for your contribution. 🍻
Please sign off in each of your commits.

[pouchrobot]

We found this is your first time to contribute to Pouch, @SimonCqk
👏 We really appreciate it.
Just remind that you have read the contribution guide: https://github.com/alibaba/pouch/blob/master/CONTRIBUTING.md
If you didn't, you should do that first. If done, welcome again and please enjoy hacking! 🍻

[CLAassistant]

All committers have signed the CLA.

[allencloud]

I reviewed the code. And I did not see any side effect brought by the update. WDYT? @fuweid

[allencloud]

Thanks a lot for your contribution. Could you also help sign the CLA? @SimonCqk

[fuweid]

LGTM