Set ret to NULL before return in EC_POINT_bn2point

[samuel40791765]

Issues:

Resolves P138896891

Description of changes:

Static analysis was complaining about us using the pointer after it was freed. I don't believe this is an actual "issue", but we might as well make the NULL explicit before returning.

Call-outs:

N/A

Testing:

N/A

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

All modified and coverable lines are covered by tests ✅

Project coverage is 78.20%. Comparing base (00fcba4) to head (d488ff7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1692   +/-   ##
=======================================
  Coverage   78.20%   78.20%           
=======================================
  Files         571      571           
  Lines       95464    95465    +1     
  Branches    13703    13704    +1     
=======================================
+ Hits        74656    74659    +3     
+ Misses      20197    20194    -3     
- Partials      611      612    +1     

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