From 8e79b7dc528b97dba14d3da8be2e19f9ad95228c Mon Sep 17 00:00:00 2001
From: Stefan Rueger <stefan.rueger@urclocks.com>
Date: Thu, 24 Nov 2022 12:16:43 +0000
Subject: [PATCH] Fix error detection for reading a page to pad unset bytes

---
 src/avr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/avr.c b/src/avr.c
index e926cc84..6d5b975c 100644
--- a/src/avr.c
+++ b/src/avr.c
@@ -960,7 +960,7 @@ int avr_write_mem(const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM *m, int
              continue;
 
           // Read flash contents to separate memory spc and fill in holes
-          if(avr_read_page_default(pgm, p, cm, beg, spc) == 0) {
+          if(avr_read_page_default(pgm, p, cm, beg, spc) >= 0) {
             pmsg_notice2("padding %s [0x%04x, 0x%04x]\n", cm->desc, beg, end-1);
             for(i = beg; i < end; i++)
               if(!(cm->tags[i] & TAG_ALLOCATED)) {