Update audio comments

Change-Id: I85d7d2f6381b251db5695202fec75128883a8662
diff --git a/services/audioflinger/StateQueue.h b/services/audioflinger/StateQueue.h
index c9b5111..e33b3c6 100644
--- a/services/audioflinger/StateQueue.h
+++ b/services/audioflinger/StateQueue.h
@@ -174,7 +174,7 @@
 #endif
 
 private:
-    static const unsigned kN = 4;       // values != 4 are not supported by this code
+    static const unsigned kN = 4;       // values < 4 are not supported by this code
     T                 mStates[kN];      // written by mutator, read by observer
 
     // "volatile" is meaningless with SMP, but here it indicates that we're using atomic ops