Clang tidy fix

[huangminghuang]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.90566% with 8 lines in your changes missing coverage. Please review.

Project coverage is 90.31%. Comparing base (4a37547) to head (c11b159).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
include/hpp_proto/grpc_support.hpp	86.95%	2 Missing and 1 partial ⚠️
tutorial/grpc/greeter_server.cpp	70.00%	1 Missing and 2 partials ⚠️
include/hpp_proto/pb_serializer.hpp	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   90.31%   90.31%           
=======================================
  Files          51       51           
  Lines        8984     8977    -7     
  Branches      633      635    +2     
=======================================
- Hits         8114     8108    -6     
  Misses        524      524           
+ Partials      346      345    -1     

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