Add a method to consume a `Box<T, A>` and return a `NonNull<T>`. This
is a convenience wrapper around `Self::into_raw` for callers that need
a `NonNull` pointer rather than a raw pointer.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/alloc/kbox.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/kernel/alloc/kbox.rs b/rust/kernel/alloc/kbox.rs
index 622b3529edfcb..e6efdd572aeea 100644
--- a/rust/kernel/alloc/kbox.rs
+++ b/rust/kernel/alloc/kbox.rs
@@ -213,6 +213,14 @@ pub fn leak<'a>(b: Self) -> &'a mut T {
         // which points to an initialized instance of `T`.
         unsafe { &mut *Box::into_raw(b) }
     }
+
+    /// Consumes the `Box<T,A>` and returns a `NonNull<T>`.
+    ///
+    /// Like [`Self::into_raw`], but returns a `NonNull`.
+    pub fn into_nonnull(b: Self) -> NonNull<T> {
+        // SAFETY: `KBox::into_raw` returns a valid pointer.
+        unsafe { NonNull::new_unchecked(Self::into_raw(b)) }
+    }
 }
 
 impl<T, A> Box<MaybeUninit<T>, A>

-- 
2.51.2