prevent segfault deleting a device with an unattached wire

GUI/Widgets/Fl_Canvas.C

@@ -458,7 +458,14 @@ void Fl_Canvas::PortClicked(Fl_DeviceGUI* Device, int Type, int Port, bool Value
 void Fl_Canvas::ClearConnections(Fl_DeviceGUI* Device)
 {
 	bool removedall=false;
-		
+	
+	//make sure we don't leave a dangling incomplete wire this will cause errors/seg-faults
+	if (UserMakingConnection() && Device && ((Device->GetID() == m_IncompleteWire.OutputID) || 
+		(Device->GetID() == m_IncompleteWire.InputID)))
+	{
+		ClearIncompleteWire();
+	}	
+	
 	while (!removedall)
 	{
 		removedall=true;

SpiralSound/Plugins/SpiralPlugin.C

@@ -44,6 +44,12 @@ SpiralPlugin::~SpiralPlugin()
 	delete m_AudioCH;
 }
 
+bool SpiralPlugin::Kill() 
+{
+	m_IsDead = true; 
+	return true;
+}
+
 PluginInfo &SpiralPlugin::Initialise(const HostInfo *Host)
 {	
 	m_HostInfo=Host;

SpiralSound/Plugins/SpiralPlugin.h

@@ -77,7 +77,7 @@ public:
 
 	// execute the audio
 	virtual void        Execute()=0;
-	virtual bool         Kill() {m_IsDead = true; return true;}
+	virtual bool         Kill();
 
 	// run the commands from the GUI
 	virtual void        ExecuteCommands() {}