[PATCH -next] virtio-balloon: Make virtballoon_free_page_report static

[YueHaibing]

Fix sparse warning:

drivers/virtio/virtio_balloon.c:168:5: warning:
 symbol 'virtballoon_free_page_report' was not declared. Should it be static?

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/virtio/virtio_balloon.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 0ef16566c3f3..bc10f94718e3 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -165,8 +165,9 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
 
 }
 
+static
 int virtballoon_free_page_report(struct page_reporting_dev_info *pr_dev_info,
-				   struct scatterlist *sg, unsigned int nents)
+				 struct scatterlist *sg, unsigned int nents)
 {
 	struct virtio_balloon *vb =
 		container_of(pr_dev_info, struct virtio_balloon, pr_dev_info);
-- 
2.17.1