Fix CodeQL warnings in SVDConv and PackChk

[grasci-arm]

No description provided.

[codecov]

Codecov Report

Merging #682 (58773ba) into main (3cd2f56) will decrease coverage by 0.03%.
The diff coverage is 45.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #682      +/-   ##
==========================================
- Coverage   50.90%   50.87%   -0.03%     
==========================================
  Files         116      116              
  Lines       21254    21270      +16     
  Branches    11650    11665      +15     
==========================================
+ Hits        10819    10821       +2     
- Misses       8445     8452       +7     
- Partials     1990     1997       +7     

Flag	Coverage Δ
packchk-cov	51.07% <0.00%> (ø)
svdconv-cov	32.45% <48.71%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tools/packchk/include/GatherCompilers.h	100.00% <ø> (ø)
tools/packchk/src/PackOptions.cpp	53.59% <0.00%> (ø)
tools/svdconv/SVDModel/src/SvdDerivedFrom.cpp	56.33% <0.00%> (-1.64%)	⬇️
tools/svdconv/SVDModel/src/SvdEnum.cpp	45.34% <0.00%> (-0.29%)	⬇️
tools/svdconv/SVDModel/src/SvdField.cpp	38.25% <0.00%> (-0.39%)	⬇️
tools/svdconv/SVDModel/src/SvdDimension.cpp	45.67% <45.83%> (-1.01%)	⬇️
tools/svdconv/SVDModel/src/SvdDevice.cpp	49.46% <60.00%> (ø)
tools/svdconv/SVDModel/src/SvdTypes.cpp	46.42% <63.63%> (ø)
tools/svdconv/SVDModel/src/SvdCExpression.cpp	65.11% <70.00%> (+1.55%)	⬆️
tools/svdconv/SVDModel/src/SvdItem.cpp	53.92% <72.22%> (ø)
... and 8 more

[github-actions]

Test Results

  8 files  16 suites   0s ⏱️
23 tests 23 ✔️ 0 💤 0 ❌
92 runs  92 ✔️ 0 💤 0 ❌

Results for commit 58773ba.

♻️ This comment has been updated with latest results.