Fix some code which causes warnings when compiled by /analyze tool

fpdfsdk/javascript/JS_Value.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/JS_Value.h"
 
 #include <time.h>
 
@@ skipping 700 matching lines @@
     return 10;
   if ((334 + _isLeapYear(year)) <= day && day < (365 + _isLeapYear(year)))
     return 11;
 
   return -1;
 }
 
 int _DateFromTime(double t) {
   int day = _DayWithinYear(t);
   int year = _YearFromTime(t);
-  bool leap = _isLeapYear(year);
+  int leap = _isLeapYear(year);
   int month = _MonthFromTime(t);
   switch (month) {
     case 0:
       return day + 1;
     case 1:
       return day - 30;
     case 2:
       return day - 58 - leap;
     case 3:
       return day - 89 - leap;
@@ skipping 161 matching lines @@
   for (size_t i = 0; i < nKeywords; ++i) {
     const wchar_t* property = va_arg(ap, const wchar_t*);
     v8::Local<v8::Value> v8Value =
         FXJS_GetObjectElement(pRuntime->GetIsolate(), pObj, property);
     if (!v8Value->IsUndefined())
       result[i] = CJS_Value(pRuntime, v8Value, CJS_Value::VT_unknown);
   }
   va_end(ap);
   return result;
 }