RFR: JDK-8292595: jdwp utf_util getWideString might leak memory

[Matthias Baesken]

There seems to be a case where utf_util.c getWideString might leak memory in an early return.

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Commit messages:
 - JDK-8292595

Changes: https://git.openjdk.org/jdk/pull/9918/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9918&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292595
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9918.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9918/head:pull/9918

PR: https://git.openjdk.org/jdk/pull/9918