Fix: donot add RET in SystemCall.Enum.cs

[Wi1l-B0t]

Don't add RET in SystemCall.Enum.cs.

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.22%. Comparing base (11bd7a1) to head (3a67e5c).

Files with missing lines	Patch %	Lines
...ler.CSharp/MethodConvert/System/SystemCall.Enum.cs	88.88%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           master-n3    #1912      +/-   ##
=============================================
- Coverage      84.23%   84.22%   -0.01%     
=============================================
  Files            308      308              
  Lines          28229    28219      -10     
  Branches        3980     3980              
=============================================
- Hits           23778    23768      -10     
  Misses          3459     3459              
  Partials         992      992              

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