Fix ubsan flagged issues

[pratikmankawde]

Details to come

[codecov]

Codecov Report

❌ Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.1%. Comparing base (0ab3e11) to head (1aebb3f).
⚠️ Report is 1 commits behind head on pratik/Add-sanitizers-to-CI-builds.

Files with missing lines	Patch %	Lines
src/xrpld/peerfinder/detail/Counts.h	90.0%	1 Missing ⚠️

Additional details and impacted files

@@                        Coverage Diff                         @@
##           pratik/Add-sanitizers-to-CI-builds   #6151   +/-   ##
==================================================================
  Coverage                                79.1%   79.1%           
==================================================================
  Files                                     836     836           
  Lines                                   71243   71250    +7     
  Branches                                 8320    8319    -1     
==================================================================
+ Hits                                    56350   56358    +8     
+ Misses                                  14893   14892    -1     

Files with missing lines	Coverage Δ
include/xrpl/basics/DecayingSample.h	88.9% <100.0%> (+0.3%)	⬆️
include/xrpl/nodestore/detail/varint.h	85.4% <100.0%> (+0.4%)	⬆️
include/xrpl/protocol/nft.h	100.0% <100.0%> (ø)
src/libxrpl/protocol/BuildInfo.cpp	98.1% <ø> (ø)
src/xrpld/app/main/BasicApp.cpp	100.0% <100.0%> (ø)
src/xrpld/peerfinder/detail/Counts.h	72.7% <90.0%> (+1.3%)	⬆️

... and 4 files with indirect coverage changes

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