Fix ipv6 extension headers parsing

[Zadamsa]

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Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 40.87%. Comparing base (b624c78) to head (a3a5131). Report is 2 commits behind head on master.

Files	Patch %	Lines
input/parser.cpp	20.00%	2 Missing and 2 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #211      +/-   ##
==========================================
- Coverage   40.88%   40.87%   -0.01%     
==========================================
  Files         104      104              
  Lines        9899     9903       +4     
  Branches     1455     1457       +2     
==========================================
+ Hits         4047     4048       +1     
- Misses       4999     5002       +3     
  Partials      853      853              

Flag	Coverage Δ
tests	40.87% <20.00%> (-0.01%)	:arrow_down:

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