[jdk17u] RFR: 8273451: Remove unreachable return in mutexLocker::wait

[Olga Mikhaltsova]

I'd like to backport JDK-8273451 to jdk17u.
The original patch applied cleanly. 
It's a code cleanup, the patch removes the unreachable statement.

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Commit messages:
 - Backport 9b5991e811b789fe8b60701657c2f0dd2c222c2e

Changes: https://git.openjdk.java.net/jdk17u/pull/90/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=90&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/jdk17u/pull/90.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/90/head:pull/90

PR: https://git.openjdk.java.net/jdk17u/pull/90