Fix MediaPlayer2AudioOutput::setAudioAttributes()

regression from Ibe19c8a259c735ea2b5822f769babaf4

Test: MediaPlayer2Test
Change-Id: If1deea900858ba817021d573d859ca8e733e260e
diff --git a/media/libmediaplayer2/MediaPlayer2AudioOutput.cpp b/media/libmediaplayer2/MediaPlayer2AudioOutput.cpp
index 3040c2d..7457d84 100644
--- a/media/libmediaplayer2/MediaPlayer2AudioOutput.cpp
+++ b/media/libmediaplayer2/MediaPlayer2AudioOutput.cpp
@@ -243,9 +243,7 @@
 
 void MediaPlayer2AudioOutput::setAudioAttributes(const jobject attributes) {
     Mutex::Autolock lock(mLock);
-    if (attributes != nullptr) {
-        sp<JObjectHolder> x = new JObjectHolder(attributes);
-    }
+    mAttributes = (attributes == nullptr) ? nullptr : new JObjectHolder(attributes);
 }
 
 audio_stream_type_t MediaPlayer2AudioOutput::getAudioStreamType() const {