op-chain-ops: withdrawal migration gaslimit

Set the withdrawal migration gas limit to
a non zero number.

op-chain-ops/crossdomain/migrate.go

@@ -64,6 +64,8 @@ func MigrateWithdrawal(withdrawal *LegacyWithdrawal, l1CrossDomainMessenger *com
 	}
 
 	versionedNonce := EncodeVersionedNonce(withdrawal.Nonce, common.Big1)
+	// Encode the call to `relayMessage` on the `CrossDomainMessenger`.
+	// The minGasLimit can safely be 0 here.
 	data, err := abi.Pack(
 		"relayMessage",
 		versionedNonce,
@@ -77,12 +79,15 @@ func MigrateWithdrawal(withdrawal *LegacyWithdrawal, l1CrossDomainMessenger *com
 		return nil, fmt.Errorf("cannot abi encode relayMessage: %w", err)
 	}
 
+	// Set the outer gas limit. This cannot be zero
+	gasLimit := uint64(len(data)*16 + 200_000)
+
 	w := NewWithdrawal(
 		withdrawal.Nonce,
 		&predeploys.L2CrossDomainMessengerAddr,
 		l1CrossDomainMessenger,
 		value,
-		new(big.Int),
+		new(big.Int).SetUint64(gasLimit),
 		data,
 	)
 	return w, nil