ffi::nstr() should be marked unsafe, since a pointer to a buffer without a trailing 0 value will cause a heap buffer overflow.

References

• https://gitlab.redox-os.org/redox-os/uefi/-/commit/b711d47e815665b0ec8949e39292ad8e3fdd0756
• https://rustsec.org/advisories/RUSTSEC-2025-0032.html