part of Karol's fix: keep the old library in loadPlugin() so that

updatePlugin() can call the reset() function.

svn path=/trunk/kdebase/kwin/; revision=141202

plugins.cpp

@@ -75,7 +75,6 @@ Client* PluginMgr::allocateClient(Workspace *ws, WId w, bool tool)
 bool PluginMgr::loadPlugin(QString nameStr)
 {
     KLibrary *oldLibrary = library;
-    library = 0;
 
     QString path = KLibLoader::findLibrary(QFile::encodeName(nameStr));