RFR (XS) 8213246: Fix typo in vmTestbase failuire to failure

[JC Beyler]

Hi all,

Could I get a review for a trivial typo fix:
Webrev: http://cr.openjdk.java.net/~jcbeyler/8213246/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8213246

Thanks,
Jc