gogensig: fix multiple fields with the same name

[tsingbx]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 38.29787% with 29 lines in your changes missing coverage. Please review.

Project coverage is 94.39%. Comparing base (0f12be8) to head (06abf22).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/gogensig/convert/type.go	20.58%	26 Missing and 1 partial ⚠️
cmd/gogensig/convert/names/names.go	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
- Coverage   98.12%   94.39%   -3.73%     
==========================================
  Files          17       18       +1     
  Lines        2132     2248     +116     
==========================================
+ Hits         2092     2122      +30     
- Misses         28      112      +84     
- Partials       12       14       +2     

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