[Bug 235281] pfsync: double fault when removing non-existent syncdev

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235281

            Bug ID: 235281
           Summary: pfsync: double fault when removing non-existent
                    syncdev
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

On 12.0-RELEASE (but not CURRENT) I can cause a double fault by setting up
pfsync, deleting the sync interface, and then trying to remove the sync
interface from pfsync0.

Steps to reproduce:

$ ifconfig tun0 create
$ kldload pfsync
$ ifconfig pfsync0 syncdev tun0
$ ifconfig tun0 destroy
$ # At this point, "ifconfig pfsync0" will still show the association with tun0
$ ifconfig pfsync0 -syncdev

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