cgroup/memcg_regression_test: fix test4 cleanup

If test_4.sh gets killed, it won't clean cgroup it created, so clean it here.

---
 .../memcg/regression/memcg_regression_test.sh      |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

index 855b0fe..55bec93 100755
@@ -211,6 +211,10 @@ test_4()
 	# test_4.sh might be killed by oom, so do clean up here
 	killall -9 memcg_test_4 2> /dev/null
 	killall -9 memcg_test_4.sh 2> /dev/null
+
+	# if test_4.sh gets killed, it won't clean cgroup it created
+	rmdir memcg/0 2> /dev/null
+
 	swapon -a
 }
 

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