Minor cleanup remove unnecessary cast since slot is int

[hwware]

It looks like make no sense here, just remove it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.03%. Comparing base (aa88453) to head (a243bcf).
Report is 1 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1865      +/-   ##
============================================
- Coverage     71.09%   71.03%   -0.07%     
============================================
  Files           123      123              
  Lines         65671    65671              
============================================
- Hits          46692    46649      -43     
- Misses        18979    19022      +43     

Files with missing lines	Coverage Δ
src/cluster_legacy.c	85.88% <100.00%> (-0.21%)	⬇️

... and 11 files with indirect coverage changes

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