drm/tegra: sor - Recursively remove debugfs tree

Removing only the root directory will fail when there are still files in
it. Instead of manually removing all files, remove the whole directory
recursively.
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/sor.c

@@ -1036,7 +1036,7 @@ static int tegra_sor_debugfs_init(struct tegra_sor *sor, struct dentry *root)
 
 static int tegra_sor_debugfs_exit(struct tegra_sor *sor)
 {
-	debugfs_remove(sor->debugfs);
+	debugfs_remove_recursive(sor->debugfs);
 	sor->debugfs = NULL;
 
 	return 0;