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

Change-Id: I5623d15da983b9277ab968d63b537ce396ad007c