vendor: cadvisor v0.39.0

Main upgrades:
- github.com/opencontainers/runc v1.0.0-rc93
- github.com/containerd/containerd v1.4.4
- github.com/docker/docker v20.10.2
- github.com/mrunalp/fileutils v0.5.0
- github.com/opencontainers/selinux v1.8.0
- github.com/cilium/ebpf v0.2.0

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs2/freezer.go

@@ -19,7 +19,7 @@ func setFreezer(dirPath string, state configs.FreezerState) error {
 		// freeze the container (since without the freezer cgroup, that's a
 		// no-op).
 		if state == configs.Undefined || state == configs.Thawed {
-			err = nil
+			return nil
 		}
 		return errors.Wrap(err, "freezer not supported")
 	}