Fix for 80105 -- adding a null-check before release, r=peterl, sr=attinasi, a=chofmann

modules/plugin/base/src/nsPluginViewer.cpp

@@ -951,7 +951,7 @@ pluginInstanceOwner :: ~pluginInstanceOwner()
       if(host)
         host->StopPluginInstance(mInstance);
     }
-    NS_RELEASE(mInstance);
+    NS_IF_RELEASE(mInstance);
   }
 
   mWindow = nsnull;

modules/plugin/nglsrc/nsPluginViewer.cpp

@@ -951,7 +951,7 @@ pluginInstanceOwner :: ~pluginInstanceOwner()
       if(host)
         host->StopPluginInstance(mInstance);
     }
-    NS_RELEASE(mInstance);
+    NS_IF_RELEASE(mInstance);
   }
 
   mWindow = nsnull;