Initialize memory manager to default.

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@175933 13f79535-47bb-0310-9956-ffa450edef68

src/xercesc/util/XMLException.cpp

@@ -166,7 +166,7 @@ XMLException::XMLException() :
     , fSrcFile(0)
     , fSrcLine(0)
     , fMsg(0)
-    , fMemoryManager(0)
+    , fMemoryManager(XMLPlatformUtils::fgMemoryManager)
 {
 }