parser: Remove dead assignments

[alanbarr]

Detected by clang scan-build

[coveralls]

Coverage decreased (-0.0007%) to 86.305% when pulling abe4ee4 on alanbarr:parsers_dead_assignment into d085a02 on universal-ctags:master.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.17%. Comparing base (52347c9) to head (abe4ee4).
⚠️ Report is 4349 commits behind head on master.

Files with missing lines	Patch %	Lines
parsers/ada.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2278      +/-   ##
==========================================
- Coverage   86.17%   86.17%   -0.01%     
==========================================
  Files         177      177              
  Lines       35832    35830       -2     
==========================================
- Hits        30880    30878       -2     
  Misses       4952     4952              

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