Replace more static casts in FWL (part 3)

xfa/src/fwl/src/lightwidget/checkbox.cpp

Index: xfa/src/fwl/src/lightwidget/checkbox.cpp
diff --git a/xfa/src/fwl/src/lightwidget/checkbox.cpp b/xfa/src/fwl/src/lightwidget/checkbox.cpp
index 7ec0c515bd6beb2f12989427dd9b3d749953a764..952c565ba703e818f6485f46d92e7730f3c63370 100644
--- a/xfa/src/fwl/src/lightwidget/checkbox.cpp
+++ b/xfa/src/fwl/src/lightwidget/checkbox.cpp
@@ -27,8 +27,9 @@ FWL_ERR CFWL_CheckBox::Initialize(const CFWL_WidgetProperties* pProperties) {
   if (m_pProperties->m_pOwner) {
     prop.m_pOwner = m_pProperties->m_pOwner->GetWidget();
   }
-  m_pIface = IFWL_CheckBox::Create();
-  FWL_ERR ret = ((IFWL_CheckBox*)m_pIface)->Initialize(prop, nullptr);
+  IFWL_CheckBox* pCheckBox = IFWL_CheckBox::Create();
+  m_pIface = pCheckBox;
+  FWL_ERR ret = pCheckBox->Initialize(prop, nullptr);
   if (ret == FWL_ERR_Succeeded) {
     CFWL_Widget::Initialize();
   }
@@ -43,10 +44,10 @@ FWL_ERR CFWL_CheckBox::SetBoxSize(FX_FLOAT fHeight) {
   return FWL_ERR_Succeeded;
 }
 int32_t CFWL_CheckBox::GetCheckState() {
-  return ((IFWL_CheckBox*)m_pIface)->GetCheckState();
+  return static_cast<IFWL_CheckBox*>(m_pIface)->GetCheckState();
 }
 FWL_ERR CFWL_CheckBox::SetCheckState(int32_t iCheck) {
-  return ((IFWL_CheckBox*)m_pIface)->SetCheckState(iCheck);
+  return static_cast<IFWL_CheckBox*>(m_pIface)->SetCheckState(iCheck);
 }
 CFWL_CheckBox::CFWL_CheckBox() {}
 CFWL_CheckBox::~CFWL_CheckBox() {}