refactor(controller): fix slice init length

[cuishuang]

The intention here should be to initialize a slice with a capacity of length rather than initializing the length of this slice.

The online demo: https://go.dev/play/p/q1BcVCmvidW

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[krancour]

Thank you @cuishuang!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.09%. Comparing base (cdec347) to head (e112869).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2648      +/-   ##
==========================================
+ Coverage   51.04%   51.09%   +0.05%     
==========================================
  Files         282      282              
  Lines       21092    21121      +29     
==========================================
+ Hits        10766    10792      +26     
- Misses       9644     9646       +2     
- Partials      682      683       +1     

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