Get rid of NULLs in xfa/

xfa/fwl/lightwidget/cfwl_combobox.cpp

Index: xfa/fwl/lightwidget/cfwl_combobox.cpp
diff --git a/xfa/fwl/lightwidget/cfwl_combobox.cpp b/xfa/fwl/lightwidget/cfwl_combobox.cpp
index 934b0d856e54c0d93169baed24a1ddc978cf2893..f20b4c1dcb156f9b1a4fd84451093c5e32ebb7b0 100644
--- a/xfa/fwl/lightwidget/cfwl_combobox.cpp
+++ b/xfa/fwl/lightwidget/cfwl_combobox.cpp
@@ -170,7 +170,7 @@ void* CFWL_ComboBox::GetItemData(int32_t iIndex) {
   CFWL_ComboBoxItem* pItem =
       static_cast<CFWL_ComboBoxItem*>(m_comboBoxData.GetItem(m_pIface, iIndex));
   if (!pItem)
-    return NULL;
+    return nullptr;
   return pItem->m_pData;
 }
 
@@ -351,9 +351,7 @@ FWL_Error CFWL_ComboBox::CFWL_ComboBoxDP::GetItemRect(IFWL_Widget* pWidget,
 
 void* CFWL_ComboBox::CFWL_ComboBoxDP::GetItemData(IFWL_Widget* pWidget,
                                                   IFWL_ListItem* pItem) {
-  if (!pItem)
-    return NULL;
-  return static_cast<CFWL_ComboBoxItem*>(pItem)->m_pData;
+  return pItem ? static_cast<CFWL_ComboBoxItem*>(pItem)->m_pData : nullptr;
 }
 
 FWL_Error CFWL_ComboBox::CFWL_ComboBoxDP::SetItemStyles(IFWL_Widget* pWidget,
@@ -390,9 +388,7 @@ FX_FLOAT CFWL_ComboBox::CFWL_ComboBoxDP::GetItemHeight(IFWL_Widget* pWidget) {
 CFX_DIBitmap* CFWL_ComboBox::CFWL_ComboBoxDP::GetItemIcon(
     IFWL_Widget* pWidget,
     IFWL_ListItem* pItem) {
-  if (!pItem)
-    return NULL;
-  return static_cast<CFWL_ComboBoxItem*>(pItem)->m_pDIB;
+  return pItem ? static_cast<CFWL_ComboBoxItem*>(pItem)->m_pDIB : nullptr;
 }
 
 FWL_Error CFWL_ComboBox::CFWL_ComboBoxDP::GetItemCheckRect(IFWL_Widget* pWidget,