RFR: 8254345: com/sun/jdi/JdwpAttachTest.java reports error incorrectly

[Alex Menkov]

Please review a trivial fix for JdwpAttachTest

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Commit messages:
 - 8254345: com/sun/jdi/JdwpAttachTest.java reports error incorrectly

Changes: https://git.openjdk.java.net/jdk/pull/619/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=619&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254345
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/619.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/619/head:pull/619

PR: https://git.openjdk.java.net/jdk/pull/619