RFR: 8322734: A redundant return in PKCS5Padding

[John Jiang]

It looks the `return` in method `PKCS5Padding::padWithLen` is redundant.

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Commit messages:
 - 8322734: A redundant return in PKCS5Padding

Changes: https://git.openjdk.org/jdk/pull/17189/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17189&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322734
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17189.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17189/head:pull/17189

PR: https://git.openjdk.org/jdk/pull/17189