Howard Wu 9b117b8c94 mk_overlayfs: fix undefined behavior
kernel logs:
```
overlayfs: upperdir is in-use as upperdir/workdir of another mount, accessing files from both mounts will result in undefined behavior.
overlayfs: workdir is in-use as upperdir/workdir of another mount, accessing files from both mounts will result in undefined behavior.
```
2023-05-26 20:23:22 +08:00
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