runtime/v2: should use defer ctx to cleanup
runtime/v2: should use defer ctx to cleanup

Signed-off-by: Wei Fu <df4176d36abdc6fd0d966de5d5471522668de494@gmail.com>

dmcgowan/containerd,vdemeester/containerd,estesp/containerd,vdemeester/containerd,containerd/containerd,thaJeztah/containerd,estesp/containerd,containerd/containerd,thaJeztah/containerd,dmcgowan/containerd,mikebrow/containerd,mikebrow/containerd