macintosh: change some data types from int to bool

Change the data type of the following variables from int to bool
across all macintosh drivers:

started
slots_started
pm121_started
wf_smu_started

Some of these issues were detected with the help of Coccinelle.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index f433521..d7cd5af 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -230,7 +230,7 @@ static void update_fans_speed (struct thermostat *th)
 
 	/* we don't care about local sensor, so we start at sensor 1 */
 	for (i = 1; i < 3; i++) {
-		int started = 0;
+		bool started = false;
 		int fan_number = (th->type == ADT7460 && i == 2);
 		int var = th->temps[i] - th->limits[i];
 
@@ -243,7 +243,7 @@ static void update_fans_speed (struct thermostat *th)
 			if (abs(var - th->last_var[fan_number]) < 2)
 				continue;
 
-			started = 1;
+			started = true;
 			new_speed = fan_speed + ((var-1)*step);
 
 			if (new_speed < fan_speed)