drm/tegra: fb: Properly release GEM objects on failure

When fbdev initialization fails, make sure to unreference the GEM
objects properly. Note that we can't do this in the general error
unwinding path because ownership of the GEM object references is
transferred to the framebuffer upon creation.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index ec5ae7c..a64f23a 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -227,7 +227,7 @@
 	info = framebuffer_alloc(0, drm->dev);
 	if (!info) {
 		dev_err(drm->dev, "failed to allocate framebuffer info\n");
-		tegra_bo_free_object(&bo->gem);
+		drm_gem_object_unreference_unlocked(&bo->gem);
 		return -ENOMEM;
 	}
 
@@ -235,6 +235,7 @@
 	if (IS_ERR(fbdev->fb)) {
 		dev_err(drm->dev, "failed to allocate DRM framebuffer\n");
 		err = PTR_ERR(fbdev->fb);
+		drm_gem_object_unreference_unlocked(&bo->gem);
 		goto release;
 	}