approval-voting: remove redundant validation check (#6266)

* approval-voting: remove a redundant check

* candidate-validation: remove unreachable check

polkadot/node/core/approval-voting/src/lib.rs

@@ -2404,28 +2404,14 @@ async fn launch_approval<Context>(
 
 		match val_rx.await {
 			Err(_) => return ApprovalState::failed(validator_index, candidate_hash),
-			Ok(Ok(ValidationResult::Valid(commitments, _))) => {
+			Ok(Ok(ValidationResult::Valid(_, _))) => {
 				// Validation checked out. Issue an approval command. If the underlying service is unreachable,
 				// then there isn't anything we can do.
 
 				gum::trace!(target: LOG_TARGET, ?candidate_hash, ?para_id, "Candidate Valid");
 
-				let expected_commitments_hash = candidate.commitments_hash;
-				if commitments.hash() == expected_commitments_hash {
-					let _ = metrics_guard.take();
-					return ApprovalState::approved(validator_index, candidate_hash)
-				} else {
-					// Commitments mismatch - issue a dispute.
-					issue_local_invalid_statement(
-						&mut sender,
-						session_index,
-						candidate_hash,
-						candidate.clone(),
-					);
-
-					metrics_guard.take().on_approval_invalid();
-					return ApprovalState::failed(validator_index, candidate_hash)
-				}
+				let _ = metrics_guard.take();
+				return ApprovalState::approved(validator_index, candidate_hash)
 			},
 			Ok(Ok(ValidationResult::Invalid(reason))) => {
 				gum::warn!(

polkadot/node/core/candidate-validation/src/lib.rs

@@ -467,11 +467,6 @@ where
 	.await;
 
 	if let Ok(ValidationResult::Valid(ref outputs, _)) = validation_result {
-		// If validation produces new commitments we consider the candidate invalid.
-		if candidate_receipt.commitments_hash != outputs.hash() {
-			return Ok(ValidationResult::Invalid(InvalidCandidate::CommitmentsHashMismatch))
-		}
-
 		let (tx, rx) = oneshot::channel();
 		match runtime_api_request(
 			sender,