[SCRUTINY] Fix unchecked return value

[nhatnghiho]

Issues:

Resolves P321757685

Description of changes:

Fix a scrutiny warning with an unchecked return value

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[justsmth]

A better resolution would be to return the failure to the caller.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.52%. Comparing base (16c148a) to head (890c725).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
tool-openssl/test_util.cc	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2773      +/-   ##
==========================================
- Coverage   78.65%   78.52%   -0.14%     
==========================================
  Files         678      678              
  Lines      116334   115346     -988     
  Branches    16312    16330      +18     
==========================================
- Hits        91507    90578     -929     
+ Misses      24039    23973      -66     
- Partials      788      795       +7     

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