[Pidgin] #16722: Fix http memleak

[Pidgin]

#16722: Fix http memleak
----------------------+-----------------------
 Reporter:  salinasv  |      Owner:  salinasv
     Type:  defect    |     Status:  new
Milestone:            |  Component:  libpurple
  Version:  3.0.0hg   |   Keywords:  memleak
----------------------+-----------------------
 https://github.com/jgeboski/purple-facebook/blob/master/patches/03-http-
 leaks.patch

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Ticket URL: <https://developer.pidgin.im/ticket/16722>
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