LOR acpi_ibm module

[Brandon Gooch]

lock order reversal:
 1st 0xffffffff807cf200 sysctl lock (sysctl lock) @
/usr/src/sys/kern/kern_sysctl.c:1608
 2nd 0xffffffff80bf1de0 ACPI IBM extras (ACPI IBM extras) @
/usr/src/sys/modules/acpi/acpi_ibm/../../../dev/acpi_support/acpi_ibm.c:481
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
_witness_debugger() at _witness_debugger+0x2e
witness_checkorder() at witness_checkorder+0x81e
_sx_xlock() at _sx_xlock+0x54
acpi_ibm_sysctl() at acpi_ibm_sysctl+0x4f
sysctl_root() at sysctl_root+0xe3
userland_sysctl() at userland_sysctl+0x158
__sysctl() at __sysctl+0xaa
syscall() at syscall+0x1dd
Xfast_syscall() at Xfast_syscall+0xd0
--- syscall (202, FreeBSD ELF64, __sysctl), rip = 0x80073769c, rsp =
0x7fffffffda58, rbp = 0x4 ---