RFR: 8273451: Remove unreachable return in mutexLocker::wait

[Leonid Mesnik]

Refactored  mutexLocker::wait to return redundant unreachable "return false;"

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Commit messages:
 - 8273451

Changes: https://git.openjdk.java.net/jdk/pull/5398/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5398&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273451
  Stats: 6 lines in 1 file changed: 0 ins; 4 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5398.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5398/head:pull/5398

PR: https://git.openjdk.java.net/jdk/pull/5398