Fixed a possible 'invalid lock sequence' when switching to an unavailable channel with the main menu open

HISTORY

@@ -9499,7 +9499,7 @@ Video Disk Recorder Revision History
   rendered the whole code branch inactive. Now this branch is only executed for devices
   that are not bonded.
 
-2020-07-10:
+2020-07-13:
 
 - Improved deleting plugins in case the plugin uses its own memory management (thanks
   to Winfried Köhler). Plugins that have been compiled with previous versions of VDR
@@ -9509,3 +9509,5 @@ Video Disk Recorder Revision History
   (reported by Thomas Reufer).
 - Fixed handling inactive shared CA pids (thanks to Helmut Binder).
 - Implemented handling multi packet CATs with MTD (thanks to Helmut Binder).
+- Fixed a possible 'invalid lock sequence' when switching to an unavailable channel
+  with the main menu open.

device.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: device.c 4.34 2020/06/27 10:24:46 kls Exp $
+ * $Id: device.c 4.35 2020/07/13 08:16:41 kls Exp $
  */
 
 #include "device.h"
@@ -808,9 +808,9 @@ bool cDevice::SwitchChannel(const cChannel *Channel, bool LiveView)
   for (int i = 3; i--;) {
       switch (SetChannel(Channel, LiveView)) {
         case scrOk:           return true;
-        case scrNotAvailable: Skins.Message(mtInfo, tr("Channel not available!"));
+        case scrNotAvailable: Skins.QueueMessage(mtInfo, tr("Channel not available!"));
                               return false;
-        case scrNoTransfer:   Skins.Message(mtError, tr("Can't start Transfer Mode!"));
+        case scrNoTransfer:   Skins.QueueMessage(mtError, tr("Can't start Transfer Mode!"));
                               return false;
         case scrFailed:       break; // loop will retry
         default:              esyslog("ERROR: invalid return value from SetChannel");