virtio: fix error handling for debug builds

On error, virtqueue_add calls START_USE but not
END_USE. Thankfully that's normally empty anyway,
but might not be when debugging. Fix it up.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 5ed228d..e383ecd 100644 (file)
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -428,6 +428,7 @@ unmap_release:
        if (indirect)
                kfree(desc);
 
+       END_USE(vq);
        return -EIO;
 }