travis: fix clang-format nit
travis: fix clang-format nit

Change-Id: I119143fbe481fcbdea527b44d0d64e6a150ce186

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