Fixing the `/ by zero` exception with tick durations less than a millisecond.
------------- Commit messages: - refactor return statement - 8310232: java.time.Clock$TickClock.millis() fails in runtime when tick is 1 microsecond Changes: https://git.openjdk.org/jdk/pull/14657/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14657&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8310232 Stats: 13 lines in 2 files changed: 10 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/14657.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14657/head:pull/14657 PR: https://git.openjdk.org/jdk/pull/14657
