small clang-tidy fixes

[neheb]

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Legend

[codecov]

Codecov Report

Merging #2493 (ed30504) into main (0d353ac) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #2493      +/-   ##
==========================================
- Coverage   62.12%   62.12%   -0.01%     
==========================================
  Files         121      121              
  Lines       22827    22823       -4     
  Branches    11206    11205       -1     
==========================================
- Hits        14181    14178       -3     
+ Misses       6439     6438       -1     
  Partials     2207     2207              

Impacted Files	Coverage Δ
src/basicio.cpp	51.73% <0.00%> (+0.06%)	⬆️
src/tiffcomposite_int.cpp	77.26% <ø> (-0.08%)	⬇️
src/tiffcomposite_int.hpp	90.26% <ø> (ø)
src/tiffvisitor_int.cpp	81.35% <100.00%> (ø)

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