Sockets must only be closed a single time

[swhitty]

Sockets cannot be closed multiple times. The listening socket of HTTPServer is closed in both stop() async and if an error is thrown in start() async throws — the socket is now only closed once and then the reference is removed preventing the another close attempt.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (743be61) 98.56% compared to head (c3ac2aa) 98.56%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   98.56%   98.56%           
=======================================
  Files          48       48           
  Lines        2717     2724    +7     
=======================================
+ Hits         2678     2685    +7     
  Misses         39       39           

Files Changed	Coverage Δ
FlyingFox/Sources/HTTPServer.swift	98.63% <100.00%> (+0.04%)	⬆️

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