linux-wandboard

thinkpad-acpi: silence bogus complain during rmmod

Fix this bogus warning during module shutdown, when
backlight event reporting is enabled:

"thinkpad_acpi: required events 0x00018000 not enabled!"

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>