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

Change-Id: Ic0586397a434045a9594b78ff955f6426b977641