I expressed the issue I have with parse_tristate_argument() in #37751: it doesn't add any value to direct use of parse_tristate(); on the contrary, it doesn't support means to reset the arg to "auto"/-1 state. The mere reason it existed is that we need a int type ret param. Since the previous attempt to address this mess failed, let's try to make the function more useful by making it accept "auto". I figure this is useful on its own. As requested in https://github.com/systemd/systemd/pull/40652#discussion_r2831833996, the function name is suffixed with _with_auto() to establish that "auto" is handled internally.
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