[PATCH -next] drm/syncobj: add missing error return code in drm_syncobj_transfer_to_timeline()

[Yang Yingliang]

If dma_fence_unwrap_merge() fails, it should return error code
in drm_syncobj_transfer_to_timeline()

Fixes: ec8d985ff26f ("drm: use dma_fence_unwrap_merge() in drm_syncobj")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/gpu/drm/drm_syncobj.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index bbad9e4696e7..0c2be8360525 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -874,8 +874,10 @@ static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
 
 	fence = dma_fence_unwrap_merge(tmp);
 	dma_fence_put(tmp);
-	if (!fence)
+	if (!fence) {
+		ret = -ENOMEM;
 		goto err_put_timeline;
+	}
 
 	chain = dma_fence_chain_alloc();
 	if (!chain) {
-- 
2.25.1