This is a primitive helper that wraps calls to pam_syslog() replacing @PAMERR@ with pam_strerror() output in the format string. This allows for a bunch of boilerplate to be removed. @PAMERR@ is only supported at the end of the string. Similarly to %m, realistically that's the only place where it is useful. Note that unlike in logging functions in log.[ch], here the error value is only used for the message and is not saved anywhere, so we don't need to care about SYNTHETIC_ERRNO.
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