Slightly simplify and optimize ipv6_serialize

[rmisev]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.66%. Comparing base (1179c10) to head (5946edc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   99.67%   99.66%   -0.01%     
==========================================
  Files          14       14              
  Lines        2425     2423       -2     
  Branches      383      382       -1     
==========================================
- Hits         2417     2415       -2     
  Misses          8        8              

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