fix availability signaling of the send queue

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Base: 85.47% // Head: 85.48% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (6da5c3c) compared to base (f78683a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3597      +/-   ##
==========================================
+ Coverage   85.47%   85.48%   +0.02%     
==========================================
  Files         140      140              
  Lines       10267    10271       +4     
==========================================
+ Hits         8775     8780       +5     
+ Misses       1107     1106       -1     
  Partials      385      385              

Impacted Files	Coverage Δ
send_queue.go	100.00% <100.00%> (+3.23%)	⬆️

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