Fix division by zero

[Zamony]

This PR fixes divisions by zero.

[CLAassistant]

All committers have signed the CLA.

[Zamony]

I don't get why the license check linter has failed. I haven't changed the license lines at the top of the file.

[codecov]

Codecov Report

Merging #71 (1925c28) into master (f6364fc) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   93.30%   93.36%   +0.05%     
==========================================
  Files           9        9              
  Lines         224      226       +2     
==========================================
+ Hits          209      211       +2     
  Misses         11       11              
  Partials        4        4              

Impacted Files	Coverage Δ
internal/cgroups/cgroups.go	96.42% <100.00%> (ø)
internal/cgroups/cgroups2.go	96.42% <100.00%> (+0.13%)	⬆️

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[sywhang]

Thanks for fixing this. Do you mind adding a test case for this?

I don't get why the license check linter has failed. I haven't changed the license lines at the top of the file.

I think that was a temporary CI error, I re-ran it and it seems ok.

[Zamony]

Do you mind adding a test case for this?

Sure. Added tests for each of the cases.