Re: [PATCH v4 3/3] rust: error: Replace pr_warn by pr_warn_once

[jens . korinth]

Sorry for the late response, the usual madness at the end of the year is
setting in.

> Do you mean removing the function altogether? i.e. migrating all
> callers to `try_from_errno`?

I think it should be `TryFrom`. The `std::From` doc [1] says:

    Note: This trait must not fail. The From trait is intended for perfect
    conversions. If the conversion can fail or is not perfect, use TryFrom.

[1]: https://doc.rust-lang.org/std/convert/trait.From.html

Jens