lang: ast: fix infinite b_queue iteration

lang/ast/unit-package.c

@@ -76,6 +76,8 @@ static void to_string(struct ivy_ast_node *node, b_string *str)
 
 		b_string_append_cstr(str, tok->t_str);
 		i++;
+
+		entry = b_queue_next(entry);
 	}
 
 	b_string_append_cstr(str, ")");