libcontainer/cgroups/fs: fix OCI runtime pause failed #6597

Job	Run time
cross-i386	1m 25s
cross-i386 (runc_nodmz)	1m 42s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 19s
test (ubuntu-20.04, 1.22.x, rootless)	6m 53s
test (ubuntu-20.04, 1.22.x, -race)	8m 18s
test (ubuntu-20.04, 1.22.x)	7m 10s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 14s
test (ubuntu-20.04, 1.23.x, rootless)	7m 7s
test (ubuntu-20.04, 1.23.x, -race)	8m 14s
test (ubuntu-20.04, 1.23.x)	7m 13s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 49s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 23s
test (ubuntu-24.04, 1.22.x, rootless)	9m 15s
test (ubuntu-24.04, 1.22.x, -race)	8m 9s
test (ubuntu-24.04, 1.22.x)	7m 13s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 48s
test (ubuntu-24.04, 1.23.x, rootless)	8m 56s
test (ubuntu-24.04, 1.23.x, -race)	8m 8s
test (ubuntu-24.04, 1.23.x)	6m 58s
test (ubuntu-24.04, 1.23.x, runc_nodmz)	7m 13s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 34s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 50s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 41s
all-done	1s
	2h 53m 33s

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