small fixes

[lukaskollmer]

small fixes

⚙️ Release Notes

• improved diagnostic messages for incorrect usage of the macro
• proper error handling when creating the pthread key

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• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 71.88%. Comparing base (2d45568) to head (0c683a8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/ThreadLocal/ThreadLocal.swift	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
- Coverage   73.34%   71.88%   -1.45%     
==========================================
  Files           4        4              
  Lines          30       32       +2     
==========================================
+ Hits           22       23       +1     
- Misses          8        9       +1     

Files with missing lines	Coverage Δ
Sources/ThreadLocalMacros/ThreadLocalMacro.swift	87.50% <ø> (ø)
Sources/ThreadLocalMacros/ThreadLocalMacros.swift	0.00% <ø> (ø)
Sources/ThreadLocal/ThreadLocal.swift	73.69% <50.00%> (-2.78%)	⬇️

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[PSchmiedmayer]

Thank you @lukaskollmer 🚀