ACPI / PAD: power_saving_thread() is not freezable

power_saving_thread() calls try_to_freeze(), but the thread doesn't mark
itself freezable through set_freezable(), so the try_to_freeze()
call is useless.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpi_pad.c

@@ -148,8 +148,6 @@ static int power_saving_thread(void *data)
 	while (!kthread_should_stop()) {
 		unsigned long expire_time;
 
-		try_to_freeze();
-
 		/* round robin to cpus */
 		expire_time = last_jiffies + round_robin_time * HZ;
 		if (time_before(expire_time, jiffies)) {