builder-next: close progress on layer export error
builder-next: close progress on layer export error

Signed-off-by: Tonis Tiigi <c2470c48b2d3312d61f94f18d3a1cd113d1915ad@gmail.com>
AkihiroSuda/docker,bearstech/moby,pradipd/moby,docker/docker,Mokolea/docker,paralin/docker,konstruktoid/docker-1,yosifkit/docker,cpuguy83/docker,mahak/docker,trebonian/docker,kojiromike/docker,jimjag/docker,thaJeztah/docker,AkihiroSuda/docker,estesp/docker,konstruktoid/docker-upstream,gnailuy/docker,jameszhan/docker,estesp/docker,yosifkit/docker,jameszhan/docker,nawawi/docker,docker/docker,jvanz/docker,nalind/docker,flavio/docker,flavio/docker,thaJeztah/docker,mahak/docker,Ramzec/docker,djs55/docker,moby/moby,AkihiroSuda/docker,konstruktoid/docker-1,jimjag/docker,bearstech/moby,ibuildthecloud/docker,ibuildthecloud/docker,jthelin/docker,SvenDowideit/docker,vdemeester/docker,estesp/docker,moby/moby,jvanz/docker,yongtang/docker,nalind/docker,jthelin/docker,konstruktoid/docker-upstream,trebonian/docker,Mokolea/docker,justincormack/docker,moul/docker,vdemeester/docker,bearstech/moby,konstruktoid/docker-1,moul/docker,yosifkit/docker,flavio/docker,jimjag/docker,yongtang/docker,thaJeztah/docker,jimjag/docker,moby/moby,cpuguy83/docker,SvenDowideit/docker,Ramzec/docker,justincormack/docker,mahak/docker,jameszhan/docker,Ramzec/docker,paralin/docker,SvenDowideit/docker,paralin/docker,gnailuy/docker,cpuguy83/docker,moby/moby,flavio/docker,nawawi/docker,trebonian/docker,ibuildthecloud/docker,gnailuy/docker,Mokolea/docker,kojiromike/docker,cpuguy83/docker,dims/docker,mahak/docker,jvanz/docker,justincormack/docker,gnailuy/docker,Ramzec/docker,moul/docker,trebonian/docker,AkihiroSuda/docker,Mokolea/docker,pradipd/moby,dims/docker,moul/docker,konstruktoid/docker-upstream,nalind/docker,konstruktoid/docker-upstream,nalind/docker,bearstech/moby,pradipd/moby,ibuildthecloud/docker,nawawi/docker,kojiromike/docker,dims/docker,thaJeztah/docker,paralin/docker,djs55/docker,nawawi/docker,yosifkit/docker,ibuildthecloud/docker,docker/docker,vdemeester/docker,djs55/docker,yongtang/docker