virtio: tools: make it clear that virtqueue_add_buf() no longer returns > 0

We simplified virtqueue_add_buf(), make it clear in the callers.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index e626fa553c5a..a11028acf219 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -164,7 +164,7 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
                                 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
                                                       dev->buf + started,
                                                       GFP_ATOMIC);
-                                if (likely(r >= 0)) {
+                                if (likely(r == 0)) {
                                         ++started;
                                         virtqueue_kick(vq->vq);
                                 }
@@ -177,7 +177,7 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
                                 r = 0;
                         }
 
-                } while (r >= 0);
+                } while (r == 0);
                 if (completed == completed_before)
                         ++spurious;
                 assert(completed <= bufs);