fixup! WIP: rust: drm/kms: Add RawPlaneState::atomic_helper_check()

rust/kernel/drm/kms/plane.rs

@@ -521,7 +521,7 @@ pub trait RawPlaneState: AsRawPlaneState {
         NonNull::new(self.as_raw().crtc).map(|c| unsafe { OpaqueCrtc::from_raw(c.as_ptr()) })
     }
 
-    /// Run the atomic check helper for this plane and the given CRTC state
+    /// Run the atomic check helper for this plane and the given CRTC state.
     fn atomic_helper_check<S>(
         &mut self,
         crtc_state: &BorrowedCrtcState<'_, S>,