From 167e9a9e486eb0dc078877f9fc71ef9eb0a589da Mon Sep 17 00:00:00 2001
From: Stefan Rueger <stefan.rueger@urclocks.com>
Date: Mon, 22 Apr 2024 15:47:51 +0100
Subject: [PATCH] Render double teardown() harmless in butterfly

---
 src/butterfly.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/butterfly.c b/src/butterfly.c
index 3f648c8a..9d453748 100644
--- a/src/butterfly.c
+++ b/src/butterfly.c
@@ -88,6 +88,7 @@ static void butterfly_setup(PROGRAMMER *pgm) {
 
 static void butterfly_teardown(PROGRAMMER *pgm) {
   mmt_free(pgm->cookie);
+  pgm->cookie = NULL;
 }
 
 static int butterfly_send(const PROGRAMMER *pgm, char *buf, size_t len) {