fix variable reference in ruby_xml_parser_default_load_external_dtd_get
fix variable reference in ruby_xml_parser_default_load_external_dtd_get

sferik/libxml-ruby,increments/libxml-ruby,sferik/libxml-ruby,sferik/libxml-ruby,xml4r/libxml-ruby,increments/libxml-ruby,sferik/libxml-ruby,sferik/libxml-ruby,xml4r/libxml-ruby,sferik/libxml-ruby,increments/libxml-ruby,xml4r/libxml-ruby