MediaPlayerService: fix returned value for getPlayedOutDurationUs().

Change-Id: Id38c146cb43543c83b8378752027cc292cdbd17b
diff --git a/media/libmediaplayerservice/MediaPlayerService.cpp b/media/libmediaplayerservice/MediaPlayerService.cpp
index 79d5001..5d8a836 100644
--- a/media/libmediaplayerservice/MediaPlayerService.cpp
+++ b/media/libmediaplayerservice/MediaPlayerService.cpp
@@ -1464,7 +1464,7 @@
 {
     Mutex::Autolock lock(mLock);
     if (mTrack == 0 || mSampleRateHz == 0) {
-        return NO_INIT;
+        return 0;
     }
 
     uint32_t numFramesPlayed;