explicit null-pointer check

source/RobotAPI/libraries/armem/client/plugins/ReaderWriterPlugin.h

@@ -47,7 +47,7 @@ namespace armarx::armem::client::plugins
         ReaderWriterPlugin(ManagedIceObject& parent, const std::string& pre) :
             ComponentPlugin(parent, pre)
         {
-            if (not armemPlugin)
+            if (armemPlugin == nullptr)
             {
                 addPlugin(armemPlugin);
             }