RFR: 8263978: Clarify why 0 argument is ignored in SecureRandom::setSeed [v3]

[Weijun Wang]

> We don't use `digest` anymore but still need to ignore the 0 argument.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  simplify

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3124/files
  - new: https://git.openjdk.java.net/jdk/pull/3124/files/6bd8b100..56dff532

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3124&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3124&range=01-02

  Stats: 7 lines in 1 file changed: 0 ins; 2 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3124.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3124/head:pull/3124

PR: https://git.openjdk.java.net/jdk/pull/3124