RFR: JDK-8027155 - test/java/io/File/NulFile.java failing when test run in othervm mode

[Dan Xu]

Hi All,

Here is a simple change to fix the test failure reported in JDK-8027155. 
Due to the code change in JDK-8025128, this test also needs to be updated.

Bug: https://bugs.openjdk.java.net/browse/JDK-8027155
Webrev: http://cr.openjdk.java.net/~dxu/8027155/webrev/

Thanks,

-Dan