fix: Ensure number of names passed to struct.rename_fields is valid

[edavisau]

Fixes #9052

[codspeed-hq]

CodSpeed Performance Report

Merging #15624 will not alter performance

_{Comparing edavisau:struct-rename-check (15259f9) with main (92902e6)}

Summary

✅ 21 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.26%. Comparing base (92902e6) to head (15259f9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15624   +/-   ##
=======================================
  Coverage   81.25%   81.26%           
=======================================
  Files        1371     1371           
  Lines      175772   175774    +2     
  Branches     2531     2531           
=======================================
+ Hits       142831   142842   +11     
+ Misses      32464    32457    -7     
+ Partials      477      475    -2     

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