More memory fixes

This fixes memory leaks in ZASF and Controller. It also sets an uninitalised variable in audio_file_processor.

plugins/audio_file_processor/audio_file_processor.cpp

@@ -740,6 +740,7 @@ AudioFileProcessorWaveView::AudioFileProcessorWaveView( QWidget * _parent, int _
 	m_to( m_sampleBuffer.frames() ),
 	m_last_from( 0 ),
 	m_last_to( 0 ),
+	m_last_amp( 0 ),
 	m_startKnob( 0 ),
 	m_endKnob( 0 ),
 	m_loopKnob( 0 ),

plugins/zynaddsubfx/LocalZynAddSubFx.cpp

@@ -89,6 +89,7 @@ LocalZynAddSubFx::LocalZynAddSubFx() :
 LocalZynAddSubFx::~LocalZynAddSubFx()
 {
 	delete m_master;
+	delete m_ioEngine;
 
 	if( --s_instanceCount == 0 )
 	{

src/core/Controller.cpp

@@ -173,8 +173,11 @@ Controller * Controller::create( ControllerTypes _ct, Model * _parent )
 			if( dummy )
 				c = dummy;
 			else
+			{
 				c = new Controller( DummyController, NULL,
 								QString() );
+				dummy = c;
+			}
 			break;
 
 		case Controller::LfoController: