check for power state only when ACPI is available #216
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In bbswitch_off() we use acpi_bus_get_device() to determine the power
state, but this feature is only available if ACPI is enabled in the
kernel, so make sure to do this check only when ACPI is available.
Fixes: 5593d95 ("Linux 3.8 compatibility hack")
Signed-off-by: Dimitri John Ledkov [email protected]
Signed-off-by: Andrea Righi [email protected]