am ce473c32: Merge "Codec Offload: Add NULL check as mCallbackThread is NULL when offloaded HAL is running BLOCKING mode"

* commit 'ce473c32705e2d1c5fcc817198101e1220b3c8f7':
  Codec Offload: Add NULL check as mCallbackThread is NULL when offloaded HAL is running BLOCKING mode
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index cac785a..0f2a445 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -3952,7 +3952,10 @@
         mMixerStatus = MIXER_DRAIN_ALL;
         threadLoop_drain();
     }
-    mCallbackThread->exit();
+    if (mUseAsyncWrite) {
+        ALOG_ASSERT(mCallbackThread != 0);
+        mCallbackThread->exit();
+    }
     PlaybackThread::threadLoop_exit();
 }