rust: alloc: align Debug implementation for Box with Display

Ensure consistency between `Debug` and `Display` for `Box` by
updating `Debug` to match the new `Display` style.

Acked-by: Danilo Krummrich <[email protected]>
Signed-off-by: Guangbo Cui <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Reworded title. - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

Author: JCKeep

rust/kernel/alloc/kbox.rs

@@ -443,7 +443,7 @@ where
     A: Allocator,
 {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        fmt::Debug::fmt(&**self, f)
+        <T as fmt::Debug>::fmt(&**self, f)
     }
 }