Add "m" prefix to fields

Change-Id: Ifdb8fa886d1ff53cd7c8aff3c2f8286e6e18dec2
diff --git a/services/audioflinger/FastMixerDumpState.h b/services/audioflinger/FastMixerDumpState.h
index d958bf4..1ef86fd 100644
--- a/services/audioflinger/FastMixerDumpState.h
+++ b/services/audioflinger/FastMixerDumpState.h
@@ -55,8 +55,8 @@
 struct FastTrackDump {
     FastTrackDump() : mFramesReady(0) { }
     /*virtual*/ ~FastTrackDump() { }
-    FastTrackUnderruns mUnderruns;
-    size_t mFramesReady;        // most recent value only; no long-term statistics kept
+    FastTrackUnderruns  mUnderruns;
+    size_t              mFramesReady;        // most recent value only; no long-term statistics kept
 };
 
 // The FastMixerDumpState keeps a cache of FastMixer statistics that can be logged by dumpsys.