small changes to syntax to get rid of compiler warnings. No changes to

* error.c HTMLparser.c testC14N.c testHTML.c testURI.c
  xmlcatalog.c xmlmemory.c xmlreader.c xmlschemastypes.c
  python/libxml.c include/libxml/xmlmemory.h: small changes
  to syntax to get rid of compiler warnings.  No changes
  to logic.
12 files changed