nvme: fix multipath batched completion accounting

Batched completions were missing the io stats accounting and bio trace
events. Move the common code to a helper and call it from the batched
and non-batched functions.

Fixes: d4d957b5 ("nvme-multipath: support io stats on the mpath device")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/core.c

@@ -414,6 +414,14 @@ static inline void nvme_end_req_zoned(struct request *req)
 	}
 }
 
+static inline void __nvme_end_req(struct request *req)
+{
+	nvme_end_req_zoned(req);
+	nvme_trace_bio_complete(req);
+	if (req->cmd_flags & REQ_NVME_MPATH)
+		nvme_mpath_end_request(req);
+}
+
 static inline void nvme_end_req(struct request *req)
 {
 	blk_status_t status = nvme_error_status(nvme_req(req)->status);
@@ -424,10 +432,7 @@ static inline void nvme_end_req(struct request *req)
 		else
 			nvme_log_error(req);
 	}
-	nvme_end_req_zoned(req);
-	nvme_trace_bio_complete(req);
-	if (req->cmd_flags & REQ_NVME_MPATH)
-		nvme_mpath_end_request(req);
+	__nvme_end_req(req);
 	blk_mq_end_request(req, status);
 }
 
@@ -476,7 +481,7 @@ void nvme_complete_batch_req(struct request *req)
 {
 	trace_nvme_complete_rq(req);
 	nvme_cleanup_cmd(req);
-	nvme_end_req_zoned(req);
+	__nvme_end_req(req);
 }
 EXPORT_SYMBOL_GPL(nvme_complete_batch_req);