For the serialization context, no fifo initialization is necessary.

On shutdown it was attempting to free uninitialized memory.

Change-Id: I9141be5a51253f87f21594ae38f7e653f9e69c6c
diff --git a/libs/rs/rsLocklessFifo.cpp b/libs/rs/rsLocklessFifo.cpp
index 70b7278..7023a1f 100644
--- a/libs/rs/rsLocklessFifo.cpp
+++ b/libs/rs/rsLocklessFifo.cpp
@@ -21,14 +21,16 @@
 using namespace android;
 using namespace android::renderscript;
 
-LocklessCommandFifo::LocklessCommandFifo() {
+LocklessCommandFifo::LocklessCommandFifo() : mBuffer(0) {
 }
 
 LocklessCommandFifo::~LocklessCommandFifo() {
     if (!mInShutdown) {
         shutdown();
     }
-    free(mBuffer);
+    if (mBuffer) {
+        free(mBuffer);
+    }
 }
 
 void LocklessCommandFifo::shutdown() {