RFR: 8278580: ProblemList javax/swing/JTree/4908142/bug4908142.java on macosx-x64

[Daniel D.Daugherty]

A trivial fix to ProblemList javax/swing/JTree/4908142/bug4908142.java on macosx-x64.

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Commit messages:
 - 8278580: ProblemList javax/swing/JTree/4908142/bug4908142.java on macosx-x64

Changes: https://git.openjdk.java.net/jdk/pull/6805/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6805&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278580
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6805.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6805/head:pull/6805

PR: https://git.openjdk.java.net/jdk/pull/6805