Review and cleanup lint warnings.

fpdfsdk/src/pdfwindow/PWL_ListBox.cpp

Index: fpdfsdk/src/pdfwindow/PWL_ListBox.cpp
diff --git a/fpdfsdk/src/pdfwindow/PWL_ListBox.cpp b/fpdfsdk/src/pdfwindow/PWL_ListBox.cpp
index c8e738a7ca31dc111e51d8270245969129e89799..2c0b79d2f118ab65022367389c6cfbabec6d6f07 100644
--- a/fpdfsdk/src/pdfwindow/PWL_ListBox.cpp
+++ b/fpdfsdk/src/pdfwindow/PWL_ListBox.cpp
@@ -391,9 +391,9 @@ CFX_FloatRect CPWL_ListBox::GetFocusRect() const {
   return CPWL_Wnd::GetFocusRect();
 }
 
-void CPWL_ListBox::AddString(const FX_WCHAR* string) {
+void CPWL_ListBox::AddString(const FX_WCHAR* str) {
   if (m_pList) {
-    m_pList->AddString(string);
+    m_pList->AddString(str);
   }
 }