[template-glib] expr: add autoptr cleanup func

[Christian Hergert <chergert src gnome org>]

commit 20639d457aff9bf8ea5de25dc2162a19cc6f45a5
Author: Christian Hergert <chergert redhat com>
Date:   Tue May 3 13:14:01 2022 -0700

    expr: add autoptr cleanup func

 src/tmpl-expr.h | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/tmpl-expr.h b/src/tmpl-expr.h
index 7686532..c34baa4 100644
--- a/src/tmpl-expr.h
+++ b/src/tmpl-expr.h
@@ -85,6 +85,8 @@ TMPL_AVAILABLE_IN_ALL
 TmplExpr *tmpl_expr_new_symbol_assign (const gchar      *symbol,
                                        TmplExpr         *right);
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC (TmplExpr, tmpl_expr_unref)
+
 G_END_DECLS
 
 #endif /* TMPL_EXPR_H */