Notes added by 'git notes add'

102b83b842bf3280d612a8cdf0ed6fb79c6dab77

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+tested by calling store_password() as root in a Debian trixie container,
+for a missing user, which gave the error above, and for an existing
+user, whose password got changed. 'make test' in src passes.
+
+the errors of the PAM authentication itself are left as they are, as
+they are already PAM's own messages and only end up in the log.