Merge pull request #5970 from crazy-max/fix-lint

lint: fix after merge conflict

Author: crazy-max

cache/refs.go

@@ -1156,7 +1156,6 @@ func (sr *immutableRef) prepareRemoteSnapshotsOverlaybdMode(ctx context.Context)
 	_, err := g.Do(ctx, sr.ID()+"-prepare-remote-snapshot", func(ctx context.Context) (_ *leaseutil.LeaseRef, rerr error) {
 		dhs := sr.descHandlers
 		for _, r := range sr.layerChain() {
-			r := r
 			snapshotID := r.getSnapshotID()
 			if _, err := r.cm.Snapshotter.Stat(ctx, snapshotID); err == nil {
 				continue