Fix incorrect use of errors.Is

[AlCutter]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 36.41%. Comparing base (46ec9c2) to head (4fa0ce3).
Report is 58 commits behind head on main.

Files	Patch %	Lines
storage/posix/files.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   35.80%   36.41%   +0.60%     
==========================================
  Files          16       33      +17     
  Lines        1363     2793    +1430     
==========================================
+ Hits          488     1017     +529     
- Misses        801     1666     +865     
- Partials       74      110      +36     

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