More NULL checks in bio_ssl.cc

[justsmth]

Description of changes:

More NULL checks in bio_ssl.cc

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.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 30.43478% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.15%. Comparing base (1df4976) to head (7259378).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
ssl/bio_ssl.cc	30.43%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3076      +/-   ##
==========================================
- Coverage   78.16%   78.15%   -0.01%     
==========================================
  Files         689      689              
  Lines      121643   121656      +13     
  Branches    16987    16992       +5     
==========================================
- Hits        95077    95076       -1     
- Misses      25682    25695      +13     
- Partials      884      885       +1     

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