cstation

Results 2 issues of cstation

Without having added a license to `module.c`, the following error frequently occurs: ``` ERROR: modpost: missing MODULE_LICENSE() in .../volatility/tools/linux/module.o ``` This PR resolves #803 and resolves #812

A TreeGrid is already returned in [pypykatz/pypykatz.py:221](https://github.com/skelsec/pypykatz/blob/dd129ff36e00593d1340776b517f7e749ad8d314/pypykatz/pypykatz.py#L221)