nvme: untangle 0 and BLK_MQ_RQ_QUEUE_OK

Let's not depend on any of the BLK_MQ_RQ_QUEUE_* constants having
specific values. No functional change.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 53584d2..e54bb10 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -269,7 +269,7 @@
 	 */
 	req->__data_len = nr_bytes;
 
-	return 0;
+	return BLK_MQ_RQ_QUEUE_OK;
 }
 
 static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
@@ -317,7 +317,7 @@
 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 		struct nvme_command *cmd)
 {
-	int ret = 0;
+	int ret = BLK_MQ_RQ_QUEUE_OK;
 
 	if (req->cmd_type == REQ_TYPE_DRV_PRIV)
 		memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));