RFR: 8201568: zForce touchscreen input device fails when closed and immediately reopened

[John Neffenger]

Fixes [JDK-8201568](https://bugs.openjdk.java.net/browse/JDK-8201568).

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Commit messages:
 - 8201568: zForce touchscreen input device fails when closed and immediately reopened

Changes: https://git.openjdk.java.net/jfx/pull/258/files
 Webrev: https://webrevs.openjdk.java.net/jfx/258/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8201568
  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/258.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/258/head:pull/258

PR: https://git.openjdk.java.net/jfx/pull/258