Type mismatch corrections (Windows 64 bits)

This patch removes the type mismatch warnings revealed by Windows 64
compiler.  Wherever necessary, used size_t type for size related data.

Change-Id: Ie045ce95940cd83fe8d681168ac9526fc6028d43
Signed-off-by: Patrick Benavoli <patrick.benavoli@intel.com>
diff --git a/xmlserializer/XmlStringDocSource.cpp b/xmlserializer/XmlStringDocSource.cpp
index ec2d7e9..8d420b6 100644
--- a/xmlserializer/XmlStringDocSource.cpp
+++ b/xmlserializer/XmlStringDocSource.cpp
@@ -39,7 +39,7 @@
                                          const std::string& strRootElementName,
                                          const std::string& strNameAttrituteName,
                                          bool bValidateWithSchema) :
-    base(xmlReadMemory(strXmlInput.c_str(), strXmlInput.size(), "", NULL, 0),
+    base(xmlReadMemory(strXmlInput.c_str(), (int)strXmlInput.size(), "", NULL, 0),
          strXmlSchemaFile,
          strRootElementType,
          strRootElementName,