The syslog functions may keep accessing the ident supplied to openlog()
by pointer with subsequent calls to syslog(). In order to not have
syslog() access random or free memory, we now keep a reference to ident
until either:

* A subsequent call to openlog()
* A call to closelog()
* System module unload/exit

Thanks to Stanislaw Klekot <pike@jarowit.net> for the report.