string_output_set(sov, g_strdup_printf("%f", *obj));
}
-static void print_type_null(Visitor *v, const char *name, Error **errp)
+static void print_type_null(Visitor *v, const char *name, QNull **obj,
+ Error **errp)
{
StringOutputVisitor *sov = to_sov(v);
char *out;