Fixed error handling when loading a plugin

CONTRIBUTORS

@@ -2523,6 +2523,7 @@ Nino Gerbino <ngerb@interfree.it>
 Markus Ehrnsperger <markus.ehrnsperger@googlemail.com>
  for reporting a problem with missing 'INCLUDES += -I$(DVBDIR)/include' in an existing
  Make.config
+ for reporting a bug in error handling when loading a plugin
 
 Werner Färber <w.faerber@gmx.de>
  for reporting a bug in handling the cPluginManager::Active() result when pressing

HISTORY

@@ -9536,7 +9536,7 @@ Video Disk Recorder Revision History
   cDvbTuner::GetSignalStats() to avoid problems with drivers that don't do this
   (thanks to Helmut Binder).
 
-2020-12-12:
+2020-12-13:
 
 - Fixed multiple recording entries in case a recording is started during the initial
   reading of the video directory (reported by Claus Muus).
@@ -9555,3 +9555,4 @@ Video Disk Recorder Revision History
   Binder).
 - Avoiding a lengthy lock on the Channels list when starting a recording (thanks to
   Helmut Binder).
+- Fixed error handling when loading a plugin (reported by Markus Ehrnsperger).

plugin.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: plugin.c 4.2 2020/06/29 09:29:06 kls Exp $
+ * $Id: plugin.c 4.3 2020/12/13 10:56:36 kls Exp $
  */
 
 #include "plugin.h"
@@ -229,9 +229,12 @@ bool cDll::Load(bool Log)
   if (!error) {
      typedef cPlugin *create_t(void);
      create_t *create = (create_t *)dlsym(handle, "VDRPluginCreator");
-     if (!(error = dlerror()))
+     error = dlerror();
+     if (!error && create) {
         plugin = create();
-     destroy = (destroy_t *)dlsym(handle, "VDRPluginDestroyer");
+        destroy = (destroy_t *)dlsym(handle, "VDRPluginDestroyer");
+        error = dlerror();
+        }
      }
   if (!error) {
      if (plugin && args) {