[jdk17u-dev] RFR: 8312612: handle WideCharToMultiByte return values

[Matthias Baesken]

8312612: handle WideCharToMultiByte return values

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

Commit messages:
 - Backport d9559f9b24ee76c074cefcaf256d11ef5a7cc5b7

Changes: https://git.openjdk.org/jdk17u-dev/pull/1928/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1928&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312612
  Stats: 32 lines in 3 files changed: 19 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1928.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1928/head:pull/1928

PR: https://git.openjdk.org/jdk17u-dev/pull/1928