Fix a compilation error that occurs if Valgrind is not enabled. This regression was caused by b2c0d6322d2307458ae2b28545f8a5c9903d7ef5 (Add witness, a simple online locking validator.).
Fix a compilation error that occurs if Valgrind is not enabled. This regression was caused by b2c0d6322d2307458ae2b28545f8a5c9903d7ef5 (Add witness, a simple online locking validator.).