Use valueAt instead of editValueAt when possible

Change-Id: I885b169f4b176a6b5c2ca9a534214b4ffff1700e
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 07fa791..afd44a1 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -1382,8 +1382,8 @@
         return;
     }
 
-    KeyedVector <int, sp<SuspendedSessionDesc> > sessionEffects =
-            mSuspendedSessions.editValueAt(index);
+    const KeyedVector <int, sp<SuspendedSessionDesc> >& sessionEffects =
+            mSuspendedSessions.valueAt(index);
 
     for (size_t i = 0; i < sessionEffects.size(); i++) {
         sp<SuspendedSessionDesc> desc = sessionEffects.valueAt(i);
@@ -1409,7 +1409,7 @@
 
     if (suspend) {
         if (index >= 0) {
-            sessionEffects = mSuspendedSessions.editValueAt(index);
+            sessionEffects = mSuspendedSessions.valueAt(index);
         } else {
             mSuspendedSessions.add(sessionId, sessionEffects);
         }
@@ -1417,7 +1417,7 @@
         if (index < 0) {
             return;
         }
-        sessionEffects = mSuspendedSessions.editValueAt(index);
+        sessionEffects = mSuspendedSessions.valueAt(index);
     }