Detect broken XML

[wdoekes]

Just now I failed to see the missing / at the end of the <recv/> tag:

  <recv request="BYE">

  <send>
    <![CDATA[

      SIP/2.0 200 OK
      [last_Via:]
      [last_From:]
      [last_To:]
      [last_Call-ID:]
      [last_CSeq:]
      Content-Length: 0

    ]]>
  </send>

SIPp swallowed the scenario, but simply stopped at the BYE.

It'd be nice if it complained about the lack of valid XML.

(Or I could've used the pysipp sippfmt command to format the XML, in which case I'd have found this quickly.)