#5015 NORM Never A: Add handles checking

[Zarro Boogs per Child]

#5015: Add handles checking
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 Reporter:  gdesmott         |       Owner:  ApprovalForUpdate
     Type:  defect           |      Status:  new              
 Priority:  normal           |   Milestone:  Never Assigned   
Component:  telepathy-salut  |     Version:                   
 Keywords:                   |    Verified:  0                
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 Daf discoverd a Salut crash that was due to invalid handles passed to OLPC
 interfaces.

 The following patch (already reviewed and merged upstream) fixes that (+
 others potential similar crashes) by backporting handles checking code
 from Gabble.

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Ticket URL: <http://dev.laptop.org/ticket/5015>
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