[PATCH] drm/virtio: Fix a NULL vs ERR_PTR() bug in virtio_gpu_user_framebuffer_create()

Smatch complains that returning a NULL here will lead to a NULL pointer
dereference in drm_mode_addfb2().  Return an error pointer instead.

Fixes: dc5698e80cf7 ("Add virtio gpu driver.")
Signed-off-by: Dan Carpenter <[email protected]>
---
This code is obviously over a decade old.  I think this patch is correct.
None of the other implementations return NULL, but I haven't tested it.
---
 drivers/gpu/drm/virtio/virtgpu_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
index 44ffffec550f..85ea252c658e 100644
--- a/drivers/gpu/drm/virtio/virtgpu_display.c
+++ b/drivers/gpu/drm/virtio/virtgpu_display.c
@@ -344,7 +344,7 @@ virtio_gpu_user_framebuffer_create(struct drm_device *dev,
 	if (ret) {
 		kfree(virtio_gpu_fb);
 		drm_gem_object_put(obj);
-		return NULL;
+		return ERR_PTR(ret);
 	}
 
 	return &virtio_gpu_fb->base;
-- 
2.53.0