AudioCommon: Use std::string for the filename parameter of StartLogAudio

Source/Core/AudioCommon/SoundStream.h

@@ -34,7 +34,7 @@ public:
 	virtual void Clear(bool mute) { m_muted = mute; }
 	bool IsMuted() const { return m_muted; }
 
-	virtual void StartLogAudio(const char *filename)
+	virtual void StartLogAudio(const std::string& filename)
 	{
 		if (! m_logAudio)
 		{