Fix use of an uninitialised CFX_Widestring in AFNumber_Keystroke.

fpdfsdk/javascript/PublicMethods.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fpdfsdk/javascript/PublicMethods.h"
 
 #include <algorithm>
 #include <vector>
@@ skipping 885 matching lines @@
     return FALSE;
 
   if (!pEvent->m_pValue)
     return FALSE;
 
   CFX_WideString& val = pEvent->Value();
   CFX_WideString& wstrChange = pEvent->Change();
   CFX_WideString wstrValue = val;
 
   if (pEvent->WillCommit()) {
-    CFX_WideString wstrValue = StrTrim(wstrValue);
-    if (wstrValue.IsEmpty())
+    CFX_WideString swTemp = StrTrim(wstrValue);
+    if (swTemp.IsEmpty())
       return TRUE;
 
-    CFX_WideString swTemp = wstrValue;
     swTemp.Replace(L",", L".");
     if (!IsNumber(swTemp.c_str())) {
       pEvent->Rc() = FALSE;
       sError = JSGetStringFromID(pContext, IDS_STRING_JSAFNUMBER_KEYSTROKE);
       Alert(pContext, sError.c_str());
     }
     return TRUE;  // it happens after the last keystroke and before validating,
   }
 
   CFX_WideString wstrSelected;
@@ skipping 889 matching lines @@
     nums.SetElement(nIndex, CJS_Value(pRuntime, sPart.c_str()));
   }
 
   if (nums.GetLength() > 0)
     vRet = nums;
   else
     vRet.SetNull();
 
   return TRUE;
 }