thermal: core: remove unnecessary mutex_init()

The mutex poweroff_lock is initialized statically. It is
unnecessary to initialize by mutex_init().
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200916062139.191233-1-miaoqinglang@huawei.com

drivers/thermal/thermal_core.c

@@ -1652,7 +1652,6 @@ static int __init thermal_init(void)
 	if (result)
 		goto error;
 
-	mutex_init(&poweroff_lock);
 	result = thermal_register_governors();
 	if (result)
 		goto error;