rust: of: use core::ffi::CStr method names

Prepare for `core::ffi::CStr` taking the place of `kernel::str::CStr` by
avoid methods that only exist on the latter.

Link: Rust-for-Linux#1075
Acked-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
Acked-by: Danilo Krummrich <[email protected]>
Signed-off-by: Tamir Duberstein <[email protected]>

Author: tamird

rust/kernel/of.rs

@@ -34,7 +34,7 @@ unsafe impl RawDeviceIdIndex for DeviceId {
 impl DeviceId {
     /// Create a new device id from an OF 'compatible' string.
     pub const fn new(compatible: &'static CStr) -> Self {
-        let src = compatible.as_bytes_with_nul();
+        let src = compatible.to_bytes_with_nul();
         // Replace with `bindings::of_device_id::default()` once stabilized for `const`.
         // SAFETY: FFI type is valid to be zero-initialized.
         let mut of: bindings::of_device_id = unsafe { core::mem::zeroed() };