fix crash @ session-restore of plugins windows

The question is: why is _owner not set [yet], when the
window is restored. This rather smells like a race condition.

gtk2_ardour/processor_box.cc

@@ -2598,7 +2598,7 @@ ProcessorBox::generate_processor_title (boost::shared_ptr<PluginInsert> pi)
 	if (owner) {
 		return string_compose(_("%1: %2 (by %3)"), owner->name(), pi->name(), maker);
 	} else {
-		return string_compose(_("%2 (by %3)"), pi->name(), maker);
+		return string_compose(_("%1 (by %2)"), pi->name(), maker);
 	}
 }
 

libs/ardour/processor.cc

@@ -63,6 +63,7 @@ Processor::Processor(Session& session, const string& name)
 	, _display_to_user (true)
 	, _pre_fader (false)
 	, _ui_pointer (0)
+	, _owner (0)
 {
 }