Initialize uninitialized var in SynchronizedQueue.

Test: pass
Change-Id: I42f9c08f7bb6501fa5dea6bc92a1864386442f2b
diff --git a/base/SynchronizedQueue.h b/base/SynchronizedQueue.h
index 0ef9e4f..356c72c 100644
--- a/base/SynchronizedQueue.h
+++ b/base/SynchronizedQueue.h
@@ -61,7 +61,7 @@
     std::mutex mMutex;
     std::queue<T> mQueue;
     const size_t mQueueLimit;
-    bool mInitialized;
+    bool mInitialized = false;
 };
 
 template <typename T>