Even more buffer checks

[coderofstuff]

Cover all grounds

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (8720204) 81.88% compared to head (ce3c260) 81.01%.

Files	Patch %	Lines
src/personal_message.c	75.00%	4 Missing ⚠️
src/sighash.c	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
- Coverage   81.88%   81.01%   -0.88%     
==========================================
  Files           8        8              
  Lines         392      395       +3     
==========================================
- Hits          321      320       -1     
- Misses         71       75       +4     

Flag	Coverage Δ
unittests	81.01% <73.68%> (-0.88%)	⬇️

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