[Pidgin] #4515: xmlnode_to_formatted_str returns incorrect length

[Pidgin]

#4515: xmlnode_to_formatted_str returns incorrect length
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  Reporter:  QuLogic    |       Owner:                          
      Type:  patch      |      Status:  new                     
  Priority:  minor      |   Milestone:                          
 Component:  libpurple  |     Version:  2.3.1                   
Resolution:             |    Keywords:  xmlnode,length,formatted
   Pending:  0          |  
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Comment (by resiak):

 Surely this should use `strlen(3)`, not `sizeof`?

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Ticket URL: <http://developer.pidgin.im/ticket/4515#comment:1>
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