RFR: 8290504: Close streams returned by ModuleReader::list

[Ryan Ernst]

This commit ensures streams returned by ModuleReader::list are closed.

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Commit messages:
 - 8290504: Close streams returned by ModuleReader::list

Changes: https://git.openjdk.org/jdk/pull/9557/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9557&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290504
  Stats: 19 lines in 5 files changed: 10 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/9557.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9557/head:pull/9557

PR: https://git.openjdk.org/jdk/pull/9557