slot-ctrl: remove two lines of unsafe

[TheButlah]

[vmenge]

is it really worth it? 🤔 it delegates the unsafe code to a third party crate but should we trust libc or rustix more?

Using libc like this causes issues on macOS :/

[TheButlah]

is it really worth it?

Yes, long term I want to try to use rustix as much as possible.

I will eventually rewrite the Ioctl stuff using it. It provides good tools for Ioctl calls. See for example my PR to nusb: https://github.com/kevinmehall/nusb/pull/65

[TheButlah]

Did you test it on an orb?

No, because the thing is the same function. But I can do that before merging.

[fouge]

@TheButlah let's resolve the conflicts and merge