btrfs: use op_is_sync to check for synchronous requests

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 71a60cc..deda46cf 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6100,7 +6100,7 @@
 	bio->bi_next = NULL;
 
 	spin_lock(&device->io_lock);
-	if (bio->bi_opf & REQ_SYNC)
+	if (op_is_sync(bio->bi_opf))
 		pending_bios = &device->pending_sync_bios;
 	else
 		pending_bios = &device->pending_bios;