blk-throttle: return proper bool type to caller instead of 0/1

Change to return true/false only for bool type return code.
Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-throttle.c

@@ -819,7 +819,7 @@ static bool throtl_slice_used(struct throtl_grp *tg, bool rw)
 	if (time_in_range(jiffies, tg->slice_start[rw], tg->slice_end[rw]))
 		return false;
 
-	return 1;
+	return true;
 }
 
 /* Trim the used slices and adjust slice start accordingly */
@@ -929,7 +929,7 @@ static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio,
 
 	if (wait)
 		*wait = jiffy_wait;
-	return 0;
+	return false;
 }
 
 static bool tg_with_in_bps_limit(struct throtl_grp *tg, struct bio *bio,
@@ -972,7 +972,7 @@ static bool tg_with_in_bps_limit(struct throtl_grp *tg, struct bio *bio,
 	jiffy_wait = jiffy_wait + (jiffy_elapsed_rnd - jiffy_elapsed);
 	if (wait)
 		*wait = jiffy_wait;
-	return 0;
+	return false;
 }
 
 /*
@@ -1022,7 +1022,7 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio,
 	    tg_with_in_iops_limit(tg, bio, &iops_wait)) {
 		if (wait)
 			*wait = 0;
-		return 1;
+		return true;
 	}
 
 	max_wait = max(bps_wait, iops_wait);
@@ -1033,7 +1033,7 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio,
 	if (time_before(tg->slice_end[rw], jiffies + max_wait))
 		throtl_extend_slice(tg, rw, jiffies + max_wait);
 
-	return 0;
+	return false;
 }
 
 static void throtl_charge_bio(struct throtl_grp *tg, struct bio *bio)