[Bug 271677] ertt module unload error at shutdown

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271677

--- Comment #2 from Mike Karels <karels@freebsd.org> ---
kldstat on the running system produced this:

Id Refs Address                Size Name
 1   65 0xffffffff80200000  1d4f878 kernel
 2    1 0xffffffff81f51000   3815d0 vmm.ko
 3    1 0xffffffff822d3000     36c0 coretemp.ko
 4    1 0xffffffff822d7000     39d0 nmdm.ko
 5    1 0xffffffff83800000   461ab0 zfs.ko
 6    1 0xffffffff83610000     799d ip_mroute.ko
 7    1 0xffffffff83618000     3370 acpi_wmi.ko
 8    1 0xffffffff8361c000     4248 ichsmb.ko
 9    1 0xffffffff83621000     2178 smbus.ko
10    1 0xffffffff83624000     5ee0 ig4.ko
11    1 0xffffffff8362a000     8770 if_bridge.ko
12    1 0xffffffff83633000     60d8 bridgestp.ko
13    1 0xffffffff8363a000     3360 uhid.ko
14    1 0xffffffff8363e000     33a0 usbhid.ko
15    1 0xffffffff83642000     32a8 hidbus.ko
16    1 0xffffffff83646000     3340 wmt.ko
17    1 0xffffffff8364a000     2a50 mac_ntpd.ko

I then did a shutdown -r now, and got this on the console:

Khelp module "ertt" can't unload until its refcount drops from 9 to 0.

Sounds like ertt isn't a separate module here.

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