pam_unix: Store empty password as empty hash
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Authored by zirias on Nov 23 2023, 11:39 AM.

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Summary

pw(8) normally refuses setting an empty password, but offers the
-w none option to do that, representing the empty password by an empty
stored hash. pam_unix allows setting an empty password with the "nullok"
option, but so far stored a hash of the empty string for it. Change this
to store an empty hash as well for consistency.