audio_processing: DestroyHandle() now returns void

The return value was not used anyhow and there is no proper action to be taken if we would have received an error. Hence, in line with issue441 we should return void upon free.

BUG=441
TESTED=trybots,modules_unittest
R=andrew@webrtc.org, aluebs@webrtc.org, kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12269004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5949 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/voice_detection_impl.h b/webrtc/modules/audio_processing/voice_detection_impl.h
index 5d06517..1dfdf20 100644
--- a/webrtc/modules/audio_processing/voice_detection_impl.h
+++ b/webrtc/modules/audio_processing/voice_detection_impl.h
@@ -47,7 +47,7 @@
   virtual void* CreateHandle() const OVERRIDE;
   virtual int InitializeHandle(void* handle) const OVERRIDE;
   virtual int ConfigureHandle(void* handle) const OVERRIDE;
-  virtual int DestroyHandle(void* handle) const OVERRIDE;
+  virtual void DestroyHandle(void* handle) const OVERRIDE;
   virtual int num_handles_required() const OVERRIDE;
   virtual int GetHandleError(void* handle) const OVERRIDE;