layers: GH422 Support addition of Buffer Validation Tests
layers: GH422 Support addition of Buffer Validation Tests

Remove dead code by getting rid of deleteMemObjInfo function,
add check for freeMemObjInfo failure, and fix an incorrect
validation test

Change-Id: Ie84d16883abfb6d4d41b06d6fa210c7011861ecd

elongbug/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers