[Varnish] #476: ESI code assumes no \0

[Varnish]

#476: ESI code assumes no \0
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 Reporter:  sky     |       Owner:  sky  
     Type:  defect  |      Status:  new  
 Priority:  normal  |   Milestone:       
Component:  build   |     Version:  trunk
 Severity:  normal  |    Keywords:       
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 This isn't true in CDATA and data:// URI fields.

 Correct solution is to check ew.p.st->len

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Ticket URL: <http://varnish.projects.linpro.no/ticket/476>
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