[1.2] dmz: overlay: minor fixups #7021

Job	Run time
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 4s
test (ubuntu-20.04, 1.22.x, rootless)	6m 53s
cross-i386	39s
test (ubuntu-20.04, 1.22.x, -race)	7m 43s
test (ubuntu-20.04, 1.22.x)	7m 2s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 17s
test (ubuntu-20.04, 1.23.x, rootless)	6m 59s
test (ubuntu-20.04, 1.23.x, -race)	7m 39s
test (ubuntu-20.04, 1.23.x)	7m 9s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 52s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 44s
test (ubuntu-24.04, 1.22.x, rootless)	9m 27s
test (ubuntu-24.04, 1.22.x, -race)	8m 7s
test (ubuntu-24.04, 1.22.x)	7m 20s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 34s
test (ubuntu-24.04, 1.23.x, rootless)	9m 26s
test (ubuntu-24.04, 1.23.x, -race)	7m 53s
test (ubuntu-24.04, 1.23.x)	6m 27s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 22s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 32s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 26s
all-done	1s
	2h 40m 36s

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