nut-tree/libnut-core

Resolve compiler warnings

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Short overview
Resolve compiler warnings

Use case
Code quality

Detailed description
There are quite q few compiler warnings on CI runs, see e.g. https://github.com/nut-tree/libnut/actions/runs/585084755

More specifically, warnings about implicit type conversions and error handling.
Since warnings should also be taken seriously, try to resolve them where possible.