oci: fix err variable scope
oci: fix err variable scope

Signed-off-by: Akihiro Suda <ea940da7e429af3d0d0c18296cabd0112a36bad5@lab.ntt.co.jp>

miaoyq/containerd,mikebrow/containerd,vdemeester/containerd,containerd/containerd,dmcgowan/containerd,miaoyq/containerd,kunalkushwaha/containerd,thaJeztah/containerd,dmcgowan/containerd,estesp/containerd,crosbymichael/containerd,thaJeztah/containerd,vdemeester/containerd,mikebrow/containerd,kunalkushwaha/containerd,crosbymichael/containerd,containerd/containerd,estesp/containerd