Record overflow cleanup

Add comments and rename one method for clarity

Change-Id: I04a9147e46e88a072256c0211b112d52202419e2
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index d41585a..5f59ca9 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -6109,7 +6109,7 @@
                         }
                     }
                 }
-                mActiveTrack->overflow();
+                mActiveTrack->clearOverflow();
             }
             // client isn't retrieving buffers fast enough
             else {