[xslt] Segfault on misplaced func:result

[Mark Howe <mark cyberporte com>]

The following segfaults xsltproc (and our own libxslt-based app):

<xsl:stylesheet
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns:func="http://exslt.org/functions";
    xmlns:exsl="http://exslt.org/common";
    extension-element-prefixes="func">

<xsl:template match="/">
  <func:result><p>goodbye cruel world</p></func:result>
</xsl:template>

</xsl:stylesheet>

It's obviously a dumb thing to feed to LibXSLT (over-zealous copy and 
paste)...