[jdk17u-dev] RFR: 8291633: Build failures with GCC 11, Alpine 3 due to incompatible casts from nullptr

[Matthias Baesken]

8291633: Build failures with GCC 11, Alpine 3 due to incompatible casts from nullptr

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Commit messages:
 - Backport c89556f6cd4d0b64f3e9e2f1dc7c51634522f205

Changes: https://git.openjdk.org/jdk17u-dev/pull/632/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=632&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291633
  Stats: 16 lines in 6 files changed: 0 ins; 0 del; 16 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/632.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/632/head:pull/632

PR: https://git.openjdk.org/jdk17u-dev/pull/632