macintosh/therm_windtunnel: Convert semaphore to mutex

	volatile int		running;

	struct task_struct	*poll_task;

	struct semaphore 	lock;

	struct mutex	 	lock;

	struct of_device	*of_dev;

	struct i2c_client	*thermostat;

static int control_loop(void *dummy)

{

	down(&x.lock);

	mutex_lock(&x.lock);

	setup_hardware();

	up(&x.lock);

	mutex_unlock(&x.lock);

	for (;;) {

		msleep_interruptible(8000);

		if (kthread_should_stop())

			break;

		down(&x.lock);

		mutex_lock(&x.lock);

		poll_temp();

		up(&x.lock);

		mutex_unlock(&x.lock);

	}

	down(&x.lock);

	mutex_lock(&x.lock);

	restore_regs();

	up(&x.lock);

	mutex_unlock(&x.lock);

	return 0;

}

	const struct apple_thermal_info *info;

	struct device_node *np;

	init_MUTEX( &x.lock );

	mutex_init(&x.lock);

	if( !(np=of_find_node_by_name(NULL, "power-mgt")) )

		return -ENODEV;