[PATCH] block: fix boolreturn.cocci warnings

[kbuild test robot]

block/elevator.c:73:9-10: WARNING: return of 0/1 in function 'elv_bio_merge_ok' with return type bool

 Return statements in functions returning bool should use
 true/false instead of 1/0.
Generated by: scripts/coccinelle/misc/boolreturn.cocci

CC: Tahsin Erdogan <tahsin@xxxxxxxxxx>
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---

 elevator.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/block/elevator.c
+++ b/block/elevator.c
@@ -70,12 +70,12 @@ static int elv_iosched_allow_bio_merge(s
 bool elv_bio_merge_ok(struct request *rq, struct bio *bio)
 {
 	if (!blk_rq_merge_ok(rq, bio))
-		return 0;
+		return false;
 
 	if (!elv_iosched_allow_bio_merge(rq, bio))
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 EXPORT_SYMBOL(elv_bio_merge_ok);