Simplify code

Use DefaultKeyedVector::valueFor to avoid extra test
Make local variables as local as possible
No double parentheses
No typedef for single use
No parentheses around indirect function call
No AudioFlinger:: prefix when not needed
Remove unnecessary casts
Remove block with only one line

Saves 128 bytes

Change-Id: I3a87430eeb01b81e7b81a1c38f6fdd3274ec48f3
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 9396a0b..50712cf 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -766,7 +766,7 @@
             virtual status_t    start(pid_t tid);
             virtual void        stop();
                     bool        write(int16_t* data, uint32_t frames);
-                    bool        bufferQueueEmpty() const { return (mBufferQueue.size() == 0) ? true : false; }
+                    bool        bufferQueueEmpty() const { return mBufferQueue.size() == 0; }
                     bool        isActive() const { return mActive; }
             const wp<ThreadBase>& thread() const { return mThread; }
 
@@ -994,8 +994,8 @@
               uint32_t nextUniqueId();
 
               status_t moveEffectChain_l(int sessionId,
-                                     AudioFlinger::PlaybackThread *srcThread,
-                                     AudioFlinger::PlaybackThread *dstThread,
+                                     PlaybackThread *srcThread,
+                                     PlaybackThread *dstThread,
                                      bool reRegister);
               PlaybackThread *primaryPlaybackThread_l();
               uint32_t primaryOutputDevice_l();