bio-integrity: fix boolreturn.cocci warnings

block/bio-integrity.c:318:10-11: WARNING: return of 0/1 in function 'bio_integrity_prep' 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

Fixes: e23947b ("bio-integrity: fold bio_integrity_enabled to bio_integrity_prep")
CC: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/bio-integrity.c

@@ -316,7 +316,7 @@ bool bio_integrity_prep(struct bio *bio)
 					     bytes, offset);
 
 		if (ret == 0)
-			return 0;
+			return false;
 
 		if (ret < bytes)
 			break;