rust: block: refactor to use &raw mut

Replace all occurrences (one) 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 <[email protected]>
Link: Rust-for-Linux/linux#1148
Signed-off-by: Antonio Hickey <[email protected]>
Acked-by: Andreas Hindborg <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
Reviewed-by: Boqun Feng <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Reworded slightly. - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

Author: antonio-hickey

rust/kernel/block/mq/request.rs

@@ -12,7 +12,7 @@ use crate::{
 };
 use core::{
     marker::PhantomData,
-    ptr::{addr_of_mut, NonNull},
+    ptr::NonNull,
     sync::atomic::{AtomicU64, Ordering},
 };
 
@@ -187,7 +187,7 @@ impl RequestDataWrapper {
     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 }
     }
 }