This patch removes unnecessary check and function calls, and it changes
appropriate types for internal variables and fixes typos.

Signed-off-by: Jiayu Hu <redacted>
Tested-by: Yinan Wang <redacted>
---
 lib/librte_vhost/rte_vhost_async.h |  8 ++++----
 lib/librte_vhost/virtio_net.c      | 16 ++++++++--------
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/lib/librte_vhost/rte_vhost_async.h b/lib/librte_vhost/rte_vhost_async.h
index c73bd7c..03bd558 100644
--- a/lib/librte_vhost/rte_vhost_async.h
+++ b/lib/librte_vhost/rte_vhost_async.h

@@ -112,7 +112,7 @@ struct rte_vhost_async_features {
 };
 
 /**
- * register a async channel for vhost
+ * register an async channel for vhost
  *
  * @param vid
  *  vhost device id async channel to be attached to

@@ -147,8 +147,8 @@ __rte_experimental
 int rte_vhost_async_channel_unregister(int vid, uint16_t queue_id);
 
 /**
- * This function submit enqueue data to async engine. This function has
- * no guranttee to the transfer completion upon return. Applications
+ * This function submits enqueue data to async engine. This function has
+ * no guarantee to the transfer completion upon return. Applications
  * should poll transfer status by rte_vhost_poll_enqueue_completed()
  *
  * @param vid

@@ -167,7 +167,7 @@ uint16_t rte_vhost_submit_enqueue_burst(int vid, uint16_t queue_id,
 		struct rte_mbuf **pkts, uint16_t count);
 
 /**
- * This function check async completion status for a specific vhost
+ * This function checks async completion status for a specific vhost
  * device queue. Packets which finish copying (enqueue) operation
  * will be returned in an array.
  *

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index fec08b2..0b63940 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c

@@ -1130,8 +1130,11 @@ async_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	}
 
 out:
-	async_fill_iter(src_it, tlen, src_iovec, tvec_idx);
-	async_fill_iter(dst_it, tlen, dst_iovec, tvec_idx);
+	if (tlen) {
+		async_fill_iter(src_it, tlen, src_iovec, tvec_idx);
+		async_fill_iter(dst_it, tlen, dst_iovec, tvec_idx);
+	} else
+		src_it->count = 0;