Use cgroupv2 super magic from golang.org/x/sys/unix

We can use this constant from the already existing sys/unix package
instead of defining it by our own.

Signed-off-by: Sascha Grunert <sgrunert@suse.com>

pkg/cgroups/cgroups.go

@@ -97,8 +97,7 @@ type controllerHandler interface {
 }
 
 const (
-	cgroupRoot         = "/sys/fs/cgroup"
-	_cgroup2SuperMagic = 0x63677270
+	cgroupRoot = "/sys/fs/cgroup"
 	// CPU is the cpu controller
 	CPU = "cpu"
 	// CPUAcct is the cpuacct controller

pkg/cgroups/cgroups_supported.go

@@ -12,6 +12,7 @@ import (
 	"syscall"
 
 	"github.com/pkg/errors"
+	"golang.org/x/sys/unix"
 )
 
 var (
@@ -27,7 +28,7 @@ func IsCgroup2UnifiedMode() (bool, error) {
 		if err := syscall.Statfs("/sys/fs/cgroup", &st); err != nil {
 			isUnified, isUnifiedErr = false, err
 		} else {
-			isUnified, isUnifiedErr = st.Type == _cgroup2SuperMagic, nil
+			isUnified, isUnifiedErr = st.Type == unix.CGROUP2_SUPER_MAGIC, nil
 		}
 	})
 	return isUnified, isUnifiedErr