[Pidgin] #8207: typo in challenge parsing should be val_end and not val_start

[Pidgin]

#8207: typo in challenge parsing should be val_end and not val_start
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Reporter:  yann   |        Type:  defect                   
  Status:  new    |   Component:  libpurple                
 Version:  2.5.4  |    Keywords:  sasl digest-md5 challenge
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 Attached is a patch for what I think is a copy/paste error. I've not
 seen any bug caused by that, but I guess the bug exists if a challenge
 ends with a trailing newline.

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Ticket URL: <http://developer.pidgin.im/ticket/8207>
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