8344361: Restore null return for invalid services from legacy providers

[phohensee]

Backport for parity with Oracle 21.0.8. Clean, low risk: obvious bug, updated and new test pass, Provider tests pass: test/jdk/java/security/Provider and test/jdk/sun/security/pkcs11/Provider.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8344361 needs maintainer approval

Issue

• JDK-8344361: Restore null return for invalid services from legacy providers (Bug - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/1597/head:pull/1597
$ git checkout pull/1597

Update a local copy of the PR:
$ git checkout pull/1597
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/1597/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1597

View PR using the GUI difftool:
$ git pr show -t 1597

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/1597.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back phh! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (71aa6704)