Rename mixBufferSize to mSinkBufferSize in AudioFlinger

Change-Id: I4d1d18d716fa3ad8c0e7cc87f5a2823422f504eb
Signed-off-by: Andy Hung <hunga@google.com>
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index 5efa746..b276ab2 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -561,7 +561,7 @@
 
     // FIXME rename these former local variables of threadLoop to standard "m" names
     nsecs_t                         standbyTime;
-    size_t                          mixBufferSize;
+    size_t                          mSinkBufferSize;
 
     // cached copies of activeSleepTimeUs() and idleSleepTimeUs() made by cacheParameters_l()
     uint32_t                        activeSleepTime;