[Bug 284051] filesystems/zfs-stats: Multiple warnings about "Use of uninitialized value"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284051

            Bug ID: 284051
           Summary: filesystems/zfs-stats: Multiple warnings about "Use of
                    uninitialized value"
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: mm@FreeBSD.org
          Reporter: terry-freebsd@glaver.org
             Flags: maintainer-feedback?(mm@FreeBSD.org)
          Assignee: mm@FreeBSD.org

Created attachment 256682
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=256682&action=edit
Error messages displayed by "zfs-stats -a"

On FreeBSD 14.2-STABLE, giving the "zfs-stats -a" command causes multiple "Use
of uninitialized value" error messages to appear.

This has been reported by 2 other people as issues directly in the GitHub issue
tracker for the project - https://github.com/mmatuska/zfs-stats/issues/10
(hence the "affects some people"), but since the author is also a FreeBSD
devdeloper, I reporting it here as well to induce triage.

The GitHub issue tracker has a fix for the first of the error lines, but the
second seems to be triggered by one or more missing sysctls if the VDEV cache
is not enabled.

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