[Pidgin] #889: undefined operation in finch/libgnt/gntwm.c

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#889: undefined operation in finch/libgnt/gntwm.c
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Reporter:  sbrabec  |       Owner:  sadrul             
    Type:  defect   |      Status:  new                
Priority:  minor    |   Component:  finch (gnt/ncurses)
 Version:  2.0      |    Keywords:                     
 Pending:  0        |  
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 According to C language documentation, result of operation "fgp ^= bgp ^=
 fgp ^= bgp" is undefined.

 Here is my attempt to fix it. Please review, intended meaning may be
 different.

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Ticket URL: <http://developer.pidgin.im/ticket/889>
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