sw_engine renderer: initialize member data in default.

static analizyer bothers us due to this.
we'd rather initialize members for free of them.

Change-Id: I23b769b94be7514a8bf6e6d683ddb90b3cd613c4

src/lib/sw_engine/tvgSwRenderer.h

@@ -52,7 +52,7 @@ public:
     void doRender();  //Internally used for threading
 
 private:
-    Surface surface;
+    Surface surface = {nullptr, 0, 0, 0};
     future<void> progress;
     queue<SwTask*> prepareTasks;
     queue<SwTask*> renderTasks;