[PATCH 11/33] rust: alloc: simplify with `NonNull::add()` now that it is stable

[Miguel Ojeda]

Currently we need to go through raw pointers and then re-create the
`NonNull` from the result of offsetting the raw pointer.

Thus, now that we bump the Rust minimum version, simplify using
`NonNull::add()` and clean the TODO note.

Signed-off-by: Miguel Ojeda <ojeda at kernel.org>
---
 rust/kernel/alloc/allocator/iter.rs | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/rust/kernel/alloc/allocator/iter.rs b/rust/kernel/alloc/allocator/iter.rs
index 5759f86029b7..e0a70b7a744a 100644
--- a/rust/kernel/alloc/allocator/iter.rs
+++ b/rust/kernel/alloc/allocator/iter.rs
@@ -42,15 +42,9 @@ fn next(&mut self) -> Option<Self::Item> {
             return None;
         }
 
-        // TODO: Use `NonNull::add()` instead, once the minimum supported compiler version is
-        // bumped to 1.80 or later.
-        //
         // SAFETY: `offset` is in the interval `[0, (self.page_count() - 1) * page::PAGE_SIZE]`,
         // hence the resulting pointer is guaranteed to be within the same allocation.
-        let ptr = unsafe { self.buf.as_ptr().add(offset) };
-
-        // SAFETY: `ptr` is guaranteed to be non-null given that it is derived from `self.buf`.
-        let ptr = unsafe { NonNull::new_unchecked(ptr) };
+        let ptr = unsafe { self.buf.add(offset) };
 
         // SAFETY:
         // - `ptr` is a valid pointer to a `Vmalloc` allocation.
-- 
2.53.0