From 159c53a2007bb6151df8cd93133b932b3af18b26 Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Tue, 25 May 2021 21:53:03 +0100
Subject: [PATCH] Check if errno is set.

---
 setter/src/z80/filename.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/setter/src/z80/filename.c b/setter/src/z80/filename.c
index 0d709e5..fd19fcd 100644
--- a/setter/src/z80/filename.c
+++ b/setter/src/z80/filename.c
@@ -51,7 +51,7 @@ void Filenames(const char* path)
         wRc = 0;
         cRc = 0;
 
-        if(!h) { rc = errno; }
+        if(!h) rc = errno != 0 ? errno : -1;
         else
         {
             ret = fprintf(h, FILENAME_FORMAT, filenames[pos]);