Fix wrong error returned for image index lookup
Fix wrong error returned for image index lookup

Seems like this was the wrong error given that we are looking up image
label.

Signed-off-by: Brian Goff <dc73d0991b982a8303e713ef531a313af77e242a@gmail.com>

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