Simple patch to acpi_ibm

[Fabian Keil]

John Baldwin <jhb at FreeBSD.org> wrote:

> Can someone with acpi_ibm(4) test that this patch works ok and removes the LOR 
> between acpi_ibm and the sysctl lock on HEAD or 8 with WITNESS enabled?

It does remove the LOR and the sysctls I tried so far (bluetooth,
fan, fan_level, thinklight) still work as expected.

Thanks
Fabian
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