NuPlayer:seek handling on kWhatAudioTearDown

Restart from previous seek time on kWhatAudioTearDown if mRenderer
didn't supply a useful positionUs.

Bug: 22662968
Change-Id: Ic21957f676ba25fb92694f71093bed60b630390b
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
index e9f3799..2e0d0d3 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
@@ -1586,16 +1586,15 @@
     mAudioTornDown = true;
 
     int64_t currentPositionUs;
-    if (getCurrentPosition(&currentPositionUs) != OK) {
-        currentPositionUs = 0;
+    sp<AMessage> notify = mNotify->dup();
+    if (getCurrentPosition(&currentPositionUs) == OK) {
+        notify->setInt64("positionUs", currentPositionUs);
     }
 
     mAudioSink->stop();
     mAudioSink->flush();
 
-    sp<AMessage> notify = mNotify->dup();
     notify->setInt32("what", kWhatAudioTearDown);
-    notify->setInt64("positionUs", currentPositionUs);
     notify->setInt32("reason", reason);
     notify->post();
 }