[Pidgin] #7974: jabber_set_buddy_icon braces wrong

[Pidgin]

#7974: jabber_set_buddy_icon braces wrong
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 Reporter:  darkrain42  |     Owner:  deryni
     Type:  patch       |    Status:  new   
Component:  XMPP        |   Version:  2.5.3 
 Keywords:              |  
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 The else statements in `jabber_set_buddy_icon` are backwards. If the user
 tries to unset the buddy icon, it throws a "received non-png data" error,
 but if the prpl is passed non-png data, it unsets the avatar.

 Attached patch reverses the two else blocks.

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Ticket URL: <http://developer.pidgin.im/ticket/7974>
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