Correct viewport initialization, bounds comparison

Change-Id: Ibd751856e3712991e149800ed179464397dad7c3
diff --git a/libs/hwui/Snapshot.h b/libs/hwui/Snapshot.h
index e9ab1ff..1a517fc 100644
--- a/libs/hwui/Snapshot.h
+++ b/libs/hwui/Snapshot.h
@@ -229,7 +229,7 @@
 
 private:
     struct ViewportData {
-        ViewportData() : mWidth(0), mHeight() {}
+        ViewportData() : mWidth(0), mHeight(0) {}
         void initialize(int width, int height) {
             mWidth = width;
             mHeight = height;