Merge "libgui: check for invalid slot in attachBuffer" into lmp-dev am:...

Merge "libgui: check for invalid slot in attachBuffer" into lmp-dev am: af33c978 am: 396cc342 am: 91a7e47a am: 6a9b41dc am: 1f8b9012 am: 0544fa45 am: 788ff8c1 am: 72c1a6f7 am: 8b99decc am: 83f226ba am: 2d4959d8 am: 6a720033 am: 55554367
am: 468ea5d0

Change-Id: I78c83942b83df0851831e4914820a602f82f722f