From cb2f9dd442c5fc98de4ea84b82300302d3b6b195 Mon Sep 17 00:00:00 2001
From: rudolfkoenig <rudolfkoenig@2b470e98-0d58-463d-a4d8-8e2adae1ed80>
Date: Sat, 6 Jun 2020 14:42:34 +0000
Subject: [PATCH] DevIo.pm: return error _only_ in the callback, if specified
 (Forum #111832)

git-svn-id: https://svn.fhem.de/fhem/trunk@22127 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/DevIo.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fhem/FHEM/DevIo.pm b/fhem/FHEM/DevIo.pm
index 7b8edf241..3952d309c 100644
--- a/fhem/FHEM/DevIo.pm
+++ b/fhem/FHEM/DevIo.pm
@@ -353,7 +353,7 @@ DevIo_OpenDev($$$;$)
     no strict "refs";
     $callback->($hash,$r) if($callback);
     use strict "refs";
-    return $r;
+    return ($callback ? undef : $r);
   };
 
   # Call initFn