Coverity fixes for P173127397

[skmcgrail]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[smittals2]

looks like unistd.h isn't available on windows, might need closesocket() from winsock2.h?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 78.67%. Comparing base (b345535) to head (399c078).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
tool/client.cc	0.00%	10 Missing ⚠️
tool/transport_common.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2014      +/-   ##
==========================================
- Coverage   78.68%   78.67%   -0.01%     
==========================================
  Files         598      598              
  Lines      103321   103329       +8     
  Branches    14687    14685       -2     
==========================================
- Hits        81296    81293       -3     
- Misses      21375    21385      +10     
- Partials      650      651       +1     

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