This new helper converts libc style syscall return values into systemd-kernel (actually: kernel style) negative errno values. It's implemented as macro-like inline function, and propagates return values >= 0 as themselves and returns -errno for negative error returns. THis is supposed to be little more than syntactic sugar so that we can reduce a lot of (short, but still) boilerplate code whever we convert libc style error handling into our own. As discussed here: https://github.com/systemd/systemd/pull/21326#discussion_r748413537
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