From e014cfc9b084b195e14d32660088fffa2412613a Mon Sep 17 00:00:00 2001
From: Stefan Rueger <stefan.rueger@urclocks.com>
Date: Mon, 22 Apr 2024 16:15:32 +0100
Subject: [PATCH] Render double teardown() harmless in avrftdi.c

---
 src/avrftdi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/avrftdi.c b/src/avrftdi.c
index aaf01b64..417fb19c 100644
--- a/src/avrftdi.c
+++ b/src/avrftdi.c
@@ -1232,12 +1232,12 @@ static void avrftdi_setup(PROGRAMMER * pgm) {
 }
 
 static void avrftdi_teardown(PROGRAMMER * pgm) {
-	avrftdi_t* pdata = to_pdata(pgm);
-
-	if(pdata) {
+	if(pgm->cookie) {
+		avrftdi_t *pdata = to_pdata(pgm);
 		ftdi_deinit(pdata->ftdic);
 		ftdi_free(pdata->ftdic);
 		mmt_free(pdata);
+		pgm->cookie = NULL;
 	}
 }