refactor(capi): Extract common error handling code

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.74011% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 87.55%. Comparing base (3c52377) to head (46a17b8).

Files	Patch %	Lines
capi/src/io.rs	97.72%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #501 +/- ## ========================================== - Coverage 87.66% 87.55% -0.12% ========================================== Files 58 58 Lines 13708 13495 -213 ========================================== - Hits 12017 11815 -202 + Misses 1691 1680 -11 ```

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