Fix typo in conditional in C++ parser

[al42and]

Introduced in b9249a8

[codecov]

Codecov Report

Base: 82.82% // Head: 82.82% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (c34c579) compared to base (c74bf5a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3646   +/-   ##
=======================================
  Coverage   82.82%   82.82%           
=======================================
  Files         223      223           
  Lines       54501    54502    +1     
=======================================
+ Hits        45142    45143    +1     
  Misses       9359     9359           

Impacted Files	Coverage Δ
parsers/cxx/cxx_tag.c	88.57% <100.00%> (+0.04%)	⬆️

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[masatake]

Thank you. I found the same one at b1da453. However, I will merge this one; mine is part of another pull request that I cannot find my time working for it now.

[masatake]

Thank you.