"isPlaying" should never block, acquiring the mutex here is unnecessary, rather than investing in a separate mutex guarding just "mFlags" we accept returning "true" from isPlaying one too many times.

Change-Id: I597577cbb3ad1afd3cb3ca91979ef24cc1a44658
related-to-bug: 2518319
diff --git a/media/libstagefright/AwesomePlayer.cpp b/media/libstagefright/AwesomePlayer.cpp
index 10b7be34..164df72 100644
--- a/media/libstagefright/AwesomePlayer.cpp
+++ b/media/libstagefright/AwesomePlayer.cpp
@@ -624,8 +624,6 @@
 }
 
 bool AwesomePlayer::isPlaying() const {
-    Mutex::Autolock autoLock(mLock);
-
     return mFlags & PLAYING;
 }