[Pidgin] #4866: username setting memory leaks

[Pidgin]

#4866: username setting memory leaks
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 Reporter:  jeff      |       Owner:  jeff 
     Type:  defect    |      Status:  new  
 Priority:  minor     |   Milestone:       
Component:  MySpace   |     Version:  2.3.1
 Keywords:  msimprpl  |     Pending:  0    
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 There appear to be some memory leaks in the username setting code added by
 #2844. In particular, `msim_msg_get_string()`returns a new string that
 must be `g_free()`'d. All cases of `msim_msg_get_string()` should be
 matched with a `g_free()` somewhere.

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Ticket URL: <http://developer.pidgin.im/ticket/4866>
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