Fix wrong offset calculation in SOME/IP-TP

[seladb]

Fixes #1890

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.81%. Comparing base (bda9c73) to head (725c48e).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1898      +/-   ##
==========================================
- Coverage   82.83%   82.81%   -0.02%     
==========================================
  Files         291      291              
  Lines       51581    51593      +12     
  Branches    11247    11449     +202     
==========================================
+ Hits        42725    42726       +1     
+ Misses       8038     7675     -363     
- Partials      818     1192     +374     

Flag	Coverage Δ
alpine320	74.56% <100.00%> (+<0.01%)	⬆️
fedora42	74.69% <100.00%> (+<0.01%)	⬆️
macos-13	81.02% <100.00%> (+<0.01%)	⬆️
macos-14	81.02% <100.00%> (-0.01%)	⬇️
macos-15	81.02% <100.00%> (+<0.01%)	⬆️
mingw32	69.91% <100.00%> (+<0.01%)	⬆️
mingw64	69.90% <100.00%> (+<0.01%)	⬆️
npcap	84.81% <100.00%> (+<0.01%)	⬆️
rhel94	74.44% <100.00%> (+<0.01%)	⬆️
ubuntu2004	58.72% <83.33%> (-0.02%)	⬇️
ubuntu2004-zstd	58.83% <83.33%> (-0.02%)	⬇️
ubuntu2204	74.37% <100.00%> (+<0.01%)	⬆️
ubuntu2204-icpx	60.73% <80.00%> (-0.04%)	⬇️
ubuntu2404	74.60% <100.00%> (+0.02%)	⬆️
ubuntu2404-arm64	74.56% <100.00%> (?)
unittest	82.81% <100.00%> (-0.02%)	⬇️
windows-2022	84.79% <100.00%> (+<0.01%)	⬆️
windows-2025	84.84% <100.00%> (+<0.01%)	⬆️
winpcap	84.94% <100.00%> (+<0.01%)	⬆️
xdp	51.28% <100.00%> (+<0.01%)	⬆️

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