Improve mono compatibility with LADSPA plugins (#7674)

include/AudioDevice.h

@@ -65,7 +65,6 @@ public:
 	virtual void unregisterPort( AudioPort * _port );
 	virtual void renamePort( AudioPort * _port );
 
-
 	inline bool supportsCapture() const
 	{
 		return m_supportsCapture;
@@ -76,11 +75,6 @@ public:
 		return m_sampleRate;
 	}
 
-	ch_cnt_t channels() const
-	{
-		return m_channels;
-	}
-
 	void processNextBuffer();
 
 	virtual void startProcessing()
@@ -109,6 +103,11 @@ protected:
 	void clearS16Buffer( int_sample_t * _outbuf,
 							const fpp_t _frames );
 
+	ch_cnt_t channels() const
+	{
+		return m_channels;
+	}
+
 	inline void setSampleRate( const sample_rate_t _new_sr )
 	{
 		m_sampleRate = _new_sr;