fixup! WIP: rust: drm/kms: Add VblankSupport

rust/kernel/drm/kms/vblank.rs

@@ -208,7 +208,8 @@ impl<T: VblankDriverCrtc> Crtc<T> {
     /// dropped.
     pub fn vblank_lock<'a>(&'a self, irq: IrqDisabled<'a>) -> VblankGuard<'a, T> {
         // SAFETY: `vbl_lock` is initialized for as long as `Crtc` is available to users
-        unsafe { bindings::spin_lock(&mut (*self.drm_dev().as_raw()).vbl_lock) };
+        // INVARIANT: We just acquired `vbl_lock`, fulfilling the invariants of `VblankGuard`
+        unsafe { bindings::spin_lock(addr_of_mut!((*self.drm_dev().as_raw()).vbl_lock)) };
 
         // SAFETY: We just acquired vbl_lock above
         unsafe { VblankGuard::new(self, irq) }