[Bug 295488] syslogd: memory leak in casper_ttymsg() via nvlist_take_string_array

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295488

Dave Cottlehuber <dch@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dch@freebsd.org,
                   |                            |jfree@freebsd.org,
                   |                            |markj@FreeBSD.org
            Version|16.0-CURRENT                |15.1-RELEASE
           Severity|Affects Only Me             |Affects Many People

--- Comment #3 from Dave Cottlehuber <dch@freebsd.org> ---
Thanks Pat for the excellent repro. Confirmed on 15.1-BETA3:

```
--- 500000 user.info messages to /tmp/leak-test.log ---
casper RSS (KB):
   3020 syslogd: syslogd.casper (syslogd)

--- 500000 user.err messages to /dev/console ---
casper RSS (KB):
 107284 syslogd: syslogd.casper (syslogd)
```

The impact of this is particularly severe for users in Google Cloud envs,
and possibly elsewhere, that log extensively to /dev/console, it's trivial
to leak GB of memory.

I believe this is introduced in  https://reviews.freebsd.org/D41465

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