RFR: 8136895: Writer not closed with disk full error, file resource leaked [v3]

[Brian Burkhalter]

> In`StreamEncoder::implClose`, move `flushLeftoverChar()` inside the `try` block and the closing of the underlying stream inside the `finally` block.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8136895: Trivial formatting corrections in tests

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13503/files
  - new: https://git.openjdk.org/jdk/pull/13503/files/181a943a..4c8ab6df

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13503&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13503&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13503.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13503/head:pull/13503

PR: https://git.openjdk.org/jdk/pull/13503