Merge "libgui: check for invalid slot in attachBuffer" into lmp-dev am: af33c978c8 am: 396cc342a7 am: 91a7e47a53 am: 6a9b41dc22 am: 1f8b90126a am: 0544fa4580 am: 788ff8c16f am: 72c1a6f762 am: 8b99decc86 am: 83f226ba1b am: 2d4959d8eb am: 6a7200333a
am: 555543674c

Change-Id: Ib86c92125d63503e5221e02189723d482ce1a0a0