RFR: 8292061: ProblemList serviceability/attach/ConcAttachTest.java on linux-all

[Daniel D. Daugherty]

A trivial fix to ProblemList serviceability/attach/ConcAttachTest.java on linux-all.

-------------

Commit messages:
 - 8292061: ProblemList serviceability/attach/ConcAttachTest.java on linux-all

Changes: https://git.openjdk.org/jdk/pull/9795/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9795&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292061
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9795.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9795/head:pull/9795

PR: https://git.openjdk.org/jdk/pull/9795