Remove dead code

RecordThread::isValidSyncEvent() returns false, so most of
RecordThread::setSyncEvent() is never executed.

Change-Id: I0cf848beb46a367a45126d2df3073c5afa2ca59c
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 8acd244..1a37f4f 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -6359,6 +6359,7 @@
 
 status_t AudioFlinger::RecordThread::setSyncEvent(const sp<SyncEvent>& event)
 {
+#if 0   // This branch is currently dead code, but is preserved in case it will be needed in future
     if (!isValidSyncEvent(event)) {
         return BAD_VALUE;
     }
@@ -6376,6 +6377,9 @@
         }
     }
     return ret;
+#else
+    return BAD_VALUE;
+#endif
 }
 
 void AudioFlinger::RecordThread::RecordTrack::destroy()