RFR: JDK-8301077: Replace NULL with nullptr in share/services/ [v2]

[Johan Sjölen]

> Do the conversion in the share/services/ sub-directory and all of its files.

Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:

  plummercj's fixes

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12189/files
  - new: https://git.openjdk.org/jdk/pull/12189/files/d2b39efa..64eae876

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12189&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12189&range=00-01

  Stats: 7 lines in 4 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/12189.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12189/head:pull/12189

PR: https://git.openjdk.org/jdk/pull/12189