chrootarchive: fix "conversion from int to string yields a string of one rune"
chrootarchive: fix "conversion from int to string yields a string of one rune"

update test to fix go 1.15 linting failure:

    pkg/chrootarchive/archive_test.go:103:32: conversion from int to string yields a string of one rune

relates to golang/go 32479

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

bearstech/moby,nawawi/docker,estesp/docker,flavio/docker,jimjag/docker,djs55/docker,moby/moby,cpuguy83/docker,Mokolea/docker,docker/docker,vdemeester/docker,bearstech/moby,thaJeztah/docker,docker/docker,justincormack/docker,konstruktoid/docker-upstream,paralin/docker,Ramzec/docker,kojiromike/docker,moul/docker,estesp/docker,gnailuy/docker,mahak/docker,nalind/docker,moul/docker,mahak/docker,nalind/docker,Mokolea/docker,jthelin/docker,nawawi/docker,kojiromike/docker,AkihiroSuda/docker,trebonian/docker,Ramzec/docker,ibuildthecloud/docker,cpuguy83/docker,trebonian/docker,gnailuy/docker,thaJeztah/docker,AkihiroSuda/docker,trebonian/docker,moby/moby,jthelin/docker,yosifkit/docker,dims/docker,jimjag/docker,djs55/docker,AkihiroSuda/docker,paralin/docker,dims/docker,nawawi/docker,flavio/docker,vdemeester/docker,gnailuy/docker,justincormack/docker,AkihiroSuda/docker,moby/moby,moby/moby,konstruktoid/docker-upstream,paralin/docker,konstruktoid/docker-1,nawawi/docker,jimjag/docker,Ramzec/docker,moul/docker,jameszhan/docker,estesp/docker,vdemeester/docker,trebonian/docker,nalind/docker,docker/docker,djs55/docker,cpuguy83/docker,mahak/docker,Mokolea/docker,konstruktoid/docker-1,justincormack/docker,gnailuy/docker,ibuildthecloud/docker,kojiromike/docker,mahak/docker,konstruktoid/docker-1,flavio/docker,ibuildthecloud/docker,cpuguy83/docker,nalind/docker,ibuildthecloud/docker,yosifkit/docker,jameszhan/docker,jameszhan/docker,thaJeztah/docker,yosifkit/docker,Ramzec/docker,paralin/docker,yosifkit/docker,ibuildthecloud/docker,moul/docker,konstruktoid/docker-upstream,jimjag/docker,dims/docker,flavio/docker,konstruktoid/docker-upstream,thaJeztah/docker,bearstech/moby,bearstech/moby,Mokolea/docker