Hotfix crash in OSX engine dialog.

This is not really a fix, just some quick hack
to make ardour start at all if there’s no prior
CoreAudio EngineState in the config.

libs/backends/wavesaudio/wavesapi/devicemanager/WCMRNativeAudio.cpp

@@ -64,6 +64,8 @@ WCMRNativeAudioNoneDevice::WCMRNativeAudioNoneDevice (WCMRAudioDeviceManager *pM
 	}
 	_m_inputBuffer = new float[__m_NumInputChannels * m_BufferSizes.back()];
 	_m_outputBuffer = new float[__m_NumOutputChannels * m_BufferSizes.back()];
+	m_DefaultBufferSize = m_BufferSizes.back();
+	m_CurrentBufferSize = m_BufferSizes.back();
 }