transport-helper: add trailing --

[PT: ensure we add an additional element to the argv array]

Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

transport-helper.c

@@ -478,6 +478,8 @@ static int get_exporter(struct transport *transport,
 	for (i = 0; i < revlist_args->nr; i++)
 		strvec_push(&fastexport->args, revlist_args->items[i].string);
 
+	strvec_push(&fastexport->args, "--");
+
 	fastexport->git_cmd = 1;
 	return start_command(fastexport);
 }