Correctly set offload info in AudioTrack

The size and version fields were not set correctly.

Test: See main topic CL
Change-Id: I48523741023d429e6ee02bf029e177b7bb2cc8cc
diff --git a/media/libaudioclient/AudioTrack.cpp b/media/libaudioclient/AudioTrack.cpp
index 2c40fbb..20feec0 100644
--- a/media/libaudioclient/AudioTrack.cpp
+++ b/media/libaudioclient/AudioTrack.cpp
@@ -538,6 +538,7 @@
     } else {
         mOffloadInfo = NULL;
         memset(&mOffloadInfoCopy, 0, sizeof(audio_offload_info_t));
+        mOffloadInfoCopy = AUDIO_INFO_INITIALIZER;
     }
 
     mVolume[AUDIO_INTERLEAVE_LEFT] = 1.0f;