builder/amazon/chroot: initial len should be 0 so we don't have empty
builder/amazon/chroot: initial len should be 0 so we don't have empty

patricklucas/packer,TranscendComputing/packer,suma/packer,Kaixiang/packer,TranscendComputing/packer,suma/packer,Kaixiang/packer,TranscendComputing/packer,patricklucas/packer,patricklucas/packer,suma/packer,patricklucas/packer,Kaixiang/packer,TranscendComputing/packer,Kaixiang/packer,suma/packer