file_ext: make sure file is always initialized when running a multithreaded iterator.

[Gottox]

fixes #298

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.30%. Comparing base (b2b0b2f) to head (ba8cbc4).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
libsqsh/src/posix/file_ext.c	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
+ Coverage   64.24%   64.30%   +0.05%     
==========================================
  Files          75       75              
  Lines        5958     5958              
  Branches      904      904              
==========================================
+ Hits         3828     3831       +3     
+ Misses       1591     1589       -2     
+ Partials      539      538       -1     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud