[PATCH 5.10] gpu/drm/virtio: fix error return in vgdev_output_init()

[Alexandr Sapozhnkiov <alsp705@gmail.com>]

From: Alexandr Sapozhnikov <alsp705@gmail.com>

Return value of function drm_crtc_init_with_planes(), 
called at virtgpu_display.c:276, is not checked, 
but it is usually checked for this function

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Alexandr Sapozhnikov <alsp705@gmail.com>
---
 drivers/gpu/drm/virtio/virtgpu_display.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
index ad924a8502e9..59b652e8a630 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -253,6 +253,7 @@ static const struct drm_connector_funcs virtio_gpu_connector_funcs = {
 
 static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
 {
+	int ret;
 	struct drm_device *dev = vgdev->ddev;
 	struct virtio_gpu_output *output = vgdev->outputs + index;
 	struct drm_connector *connector = &output->conn;
@@ -273,8 +274,10 @@ static int vgdev_output_init(struct virtio_gpu_device *vgdev, int index)
 	cursor = virtio_gpu_plane_init(vgdev, DRM_PLANE_TYPE_CURSOR, index);
 	if (IS_ERR(cursor))
 		return PTR_ERR(cursor);
-	drm_crtc_init_with_planes(dev, crtc, primary, cursor,
+	ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
 				  &virtio_gpu_crtc_funcs, NULL);
+	if (ret)
+		return ret;
 	drm_crtc_helper_add(crtc, &virtio_gpu_crtc_helper_funcs);
 
 	drm_connector_init(dev, connector, &virtio_gpu_connector_funcs,
-- 
2.43.0