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Automatic merge from submit-queue (batch tested with PRs 39493, 39496) kubelet: fix nil deref in volume type check An attempt to address memory exhaustion through a build up of terminated pods with memory backed volumes on the node in PR https://github.com/kubernetes/kubernetes/pull/36779 introduced this. For the `VolumeSpec`, either the `Volume` or `PersistentVolume` field is set, not both. This results in a situation where there is a nil deref on PVs. Since PVs are inherently not memory-backend, only local/temporal volumes should be considered. This needs to go into 1.5 as well. Fixes #39480 @saad-ali @derekwaynecarr @grosskur @gnufied ```release-note fixes nil dereference when doing a volume type check on persistent volumes ```