Fix curl multi

[matyhtf]

No description provided.

[codecov]

Codecov Report

Merging #4099 (a63461f) into master (cd7f51c) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4099   +/-   ##
=======================================
  Coverage   48.79%   48.80%           
=======================================
  Files          71       71           
  Lines       14269    14269           
=======================================
+ Hits         6963     6964    +1     
+ Misses       7306     7305    -1     

Impacted Files	Coverage Δ
src/os/async_thread.cc	69.29% <0.00%> (+0.43%)	⬆️

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