[PATCH] rust: kunit: use crate-level mapping for `c_void`

[Jesung Yang]

Use `kernel::ffi::c_void` instead of `core::ffi::c_void` for consistency
and to centralize abstraction.

Since `kernel::ffi::c_void` is a transparent wrapper around
`core::ffi::c_void`, both are functionally equivalent. However, using
`kernel::ffi::c_void` improves consistency across the kernel's Rust code
and provides a unified reference point in case the definition ever needs
to change, even if such a change is unlikely.

Signed-off-by: Jesung Yang <y.j3ms.n@xxxxxxxxx>
---
 rust/kernel/kunit.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
index 81833a687b75..bd6fc712dd79 100644
--- a/rust/kernel/kunit.rs
+++ b/rust/kernel/kunit.rs
@@ -6,7 +6,8 @@
 //!
 //! Reference: <https://docs.kernel.org/dev-tools/kunit/index.html>
 
-use core::{ffi::c_void, fmt};
+use core::fmt;
+use kernel::ffi::c_void;
 
 /// Prints a KUnit error-level message.
 ///
-- 
2.39.5