Merge pull request #10767 from cpuguy83/fix_racey_exec_cgroup_test

Fix race detected in TestExecCgroup
Upstream-commit: 7d65473b809d8a1ee2f1014139707d50a737f1af
Component: engine

components/engine/integration-cli/docker_cli_exec_test.go

@@ -424,7 +424,7 @@ func TestExecCgroup(t *testing.T) {
 	for i := 0; i < 5; i++ {
 		wg.Add(1)
 		go func() {
-			cmd = exec.Command(dockerBinary, "exec", "testing", "cat", "/proc/self/cgroup")
+			cmd := exec.Command(dockerBinary, "exec", "testing", "cat", "/proc/self/cgroup")
 			out, _, err := runCommandWithOutput(cmd)
 			if err != nil {
 				t.Fatal(out, err)