[xml] libxml2-2.4.3 duplicated assignment

[Justin Fletcher <justin fletcher ntlworld com>]

Hiya,

Very tiny thing...

catalog.c, lines around 2089 are :

--8<--------
    if (xmlDefaultXMLCatalogList != NULL)
        xmlFreeCatalogEntryList(xmlDefaultXMLCatalogList);
    xmlDefaultXMLCatalogList = NULL;
->  xmlDefaultXMLCatalogList = NULL;
    if (xmlDefaultCatalog != NULL)
        xmlHashFree(xmlDefaultCatalog,
                    (xmlHashDeallocator) xmlFreeCatalogEntry);
--8<--------

Assignment is duplicated. This will have no effect on any compiler worth
its salt, but it's odd.

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