rust: kernel: clean beta Clippy needless_borrow warnings

The warning is now in the `style` group.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

rust/kernel/chrdev.rs

@@ -169,7 +169,7 @@ impl<const N: usize> Registration<{ N }> {
         // SAFETY: The adapter doesn't retrieve any state yet, so it's compatible with any
         // registration.
         let fops = unsafe { file_operations::FileOperationsVtable::<Self, T>::build() };
-        let mut cdev = Cdev::alloc(fops, &this.this_module)?;
+        let mut cdev = Cdev::alloc(fops, this.this_module)?;
         cdev.add(inner.dev + inner.used as bindings::dev_t, 1)?;
         inner.cdevs[inner.used].replace(cdev);
         inner.used += 1;

rust/kernel/error.rs

@@ -112,7 +112,7 @@ impl fmt::Debug for Error {
         // SAFETY: `'static` string from C, and is not NULL.
         let cstr = unsafe { CStr::from_char_ptr(name) };
         // SAFETY: These strings are ASCII-only.
-        let str = unsafe { str::from_utf8_unchecked(&cstr) };
+        let str = unsafe { str::from_utf8_unchecked(cstr) };
         f.debug_tuple(str).finish()
     }
 }