Fix more bugs found by /analyze tool

xfa/fwl/core/cfwl_widgetmgr.cpp

Index: xfa/fwl/core/cfwl_widgetmgr.cpp
diff --git a/xfa/fwl/core/cfwl_widgetmgr.cpp b/xfa/fwl/core/cfwl_widgetmgr.cpp
index 90d621477a5f50475e3446e1f458ca2aa26adeac..65cf48d63f14164c0b42154e182516cbaae67638 100644
--- a/xfa/fwl/core/cfwl_widgetmgr.cpp
+++ b/xfa/fwl/core/cfwl_widgetmgr.cpp
@@ -768,8 +768,8 @@ FX_BOOL CFWL_WidgetMgrDelegate::IsNeedRepaint(IFWL_Widget* pWidget,
   FX_BOOL bOrginPtIntersectWidthDirty =
       rtDirty.Contains(rtWidget.left, rtWidget.top);
   static FWL_NEEDREPAINTHITDATA hitPoint[kNeedRepaintHitPoints];
-  int32_t iSize = sizeof(FWL_NEEDREPAINTHITDATA);
-  FXSYS_memset(hitPoint, 0, iSize);
+  FXSYS_memset(hitPoint, 0,
+               sizeof(FWL_NEEDREPAINTHITDATA) * kNeedRepaintHitPoints);

[Tom Sepez, 2016/06/03 18:54:37]

just sizeof(hitPoint)

[Wei Li, 2016/06/03 19:48:21]

Done.

This one is a real bug too, hitPoint's content such as bNotContainByDirty was
used without be initialized. The
state is unknown. 

   FX_FLOAT fxPiece = rtWidget.width / kNeedRepaintHitPiece;
   FX_FLOAT fyPiece = rtWidget.height / kNeedRepaintHitPiece;
   hitPoint[2].hitPoint.x = hitPoint[6].hitPoint.x = rtWidget.left;