libs/go/sia/util: fix dropped error

[alrs]

This fixes a dropped err in libs/go/sia/util. Unit tests pass both before and after the change.

[gemini-code-assist]

Summary of Changes

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This pull request addresses a critical error handling oversight within the libs/go/sia/util package. Specifically, it rectifies a situation where an error returned by the tls.X509KeyPair function was not being caught, which could lead to silent failures or unexpected behavior. By adding the necessary error check, the change enhances the robustness and reliability of certificate parsing and loading operations.

Highlights

• Error Handling: Fixed a dropped error in the GetRoleCertificate function where the result of tls.X509KeyPair was not being checked for potential errors, ensuring proper error propagation.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a dropped error by adding necessary error handling. My review includes a comment on the new code block that points out a related, underlying bug that this change will now expose. Addressing that bug will make the function behave as expected.