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/XmlElement.cpp b/xmlserializer/XmlElement.cpp
index d45f360..8f86c77 100644
--- a/xmlserializer/XmlElement.cpp
+++ b/xmlserializer/XmlElement.cpp
@@ -175,10 +175,10 @@
     return false;
 }
 
-uint32_t CXmlElement::getNbChildElements() const
+size_t CXmlElement::getNbChildElements() const
 {
     CXmlElement childElement;
-    uint32_t uiNbChildren = 0;
+    size_t uiNbChildren = 0;
 
     CChildIterator childIterator(*this);