fix(fork): Explicitly handle children's segfault

[achimnol]

No description provided.

[codecov]

Codecov Report

Merging #27 (97426f5) into main (17b47b9) will increase coverage by 5.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   72.34%   77.35%   +5.01%     
==========================================
  Files          10       10              
  Lines         846      848       +2     
==========================================
+ Hits          612      656      +44     
+ Misses        234      192      -42     

Impacted Files	Coverage Δ
src/aiotools/compat.py	100.00% <100.00%> (ø)
src/aiotools/fork.py	78.10% <100.00%> (+31.43%)	⬆️

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