[PATCH v5 16/17] rust: block: refactor to use `&raw [const|mut]`

[Antonio Hickey]

Replacing all occurrences of `addr_of_mut!(place)` with
`&raw mut place`.

This will allow us to reduce macro complexity, and improve consistency
with existing reference syntax as `&raw mut` is similar to `&mut`
making it fit more naturally with other existing code.

Suggested-by: Benno Lossin <benno.lossin@xxxxxxxxx>
Link: https://github.com/Rust-for-Linux/linux/issues/1148
Signed-off-by: Antonio Hickey <contact@xxxxxxxxxxxxxxxxx>
---
 rust/kernel/block/mq/request.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/block/mq/request.rs b/rust/kernel/block/mq/request.rs
index 7943f43b9575..4a5b7ec914ef 100644
--- a/rust/kernel/block/mq/request.rs
+++ b/rust/kernel/block/mq/request.rs
@@ -12,7 +12,7 @@
 };
 use core::{
     marker::PhantomData,
-    ptr::{addr_of_mut, NonNull},
+    ptr::NonNull,
     sync::atomic::{AtomicU64, Ordering},
 };
 
@@ -187,7 +187,7 @@ pub(crate) fn refcount(&self) -> &AtomicU64 {
     pub(crate) unsafe fn refcount_ptr(this: *mut Self) -> *mut AtomicU64 {
         // SAFETY: Because of the safety requirements of this function, the
         // field projection is safe.
-        unsafe { addr_of_mut!((*this).refcount) }
+        unsafe { &raw mut (*this).refcount }
     }
 }