We cannot just use %m, because strerror returns a confusing error message for ESRCH or ENOEXEC. udev code was doing a good job, but the error handling was very verbose. Let's encapsulate the customized error messages in a helper. No functional change, except that the error messages have a slightly different form now. The old messages were a bit better, but we don't have as much flexibility in the new scheme. "Failed to resolve user 'foo': Unknown user" should be good enough.
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