stagefright: warnings be gone, some are now errors, use clang

Change-Id: I81f438ae444f04c12ae27ae4ef6d073033de172c
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerDecoderBase.h b/media/libmediaplayerservice/nuplayer/NuPlayerDecoderBase.h
index 97e9269..331a2a8 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerDecoderBase.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerDecoderBase.h
@@ -26,7 +26,7 @@
 
 struct ABuffer;
 struct MediaCodec;
-struct MediaBuffer;
+class MediaBuffer;
 
 struct NuPlayer::DecoderBase : public AHandler {
     DecoderBase(const sp<AMessage> &notify);