sockfd: check the result of nni_aio_schedule

[gdamore]

This fixes a possible failure condition on teardown.

fixes #

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.84%. Comparing base (d017a6a) to head (397b500).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core/sockfd.c	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1957      +/-   ##
==========================================
+ Coverage   81.79%   81.84%   +0.05%     
==========================================
  Files          94       94              
  Lines       24006    24007       +1     
  Branches     3199     3200       +1     
==========================================
+ Hits        19635    19648      +13     
+ Misses       4299     4283      -16     
- Partials       72       76       +4     

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