Fixing: RecognitionService logcat spam "cancel called..."

Bug fix for: http://b/issue?id=2647644

RecognitionService logcat spam "cancel called with no preceding startListening - ignoring"

Change-Id: I1da8b4d40406929ed0225d40cfac629507e71c7e

Author: Valentin Kravtsov

core/java/android/speech/RecognitionService.java

@@ -118,7 +118,7 @@ private void dispatchStopListening(IRecognitionListener listener) {
 
     private void dispatchCancel(IRecognitionListener listener) {
         if (mCurrentCallback == null) {
-            Log.w(TAG, "cancel called with no preceding startListening - ignoring");
+            if (DBG) Log.d(TAG, "cancel called with no preceding startListening - ignoring");
         } else if (mCurrentCallback.mListener.asBinder() != listener.asBinder()) {
             Log.w(TAG, "cancel called by client who did not call startListening - ignoring");
         } else { // the correct state