[jdk21u-dev] RFR: 8333360: PrintNullString.java doesn't use float arguments

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle

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Commit messages:
 - Backport aaaa86b57172d45d1126c50efc270c6e49aba7a5

Changes: https://git.openjdk.org/jdk21u-dev/pull/1238/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1238&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333360
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1238.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1238/head:pull/1238

PR: https://git.openjdk.org/jdk21u-dev/pull/1238