[jdk21u-dev] RFR: 8325382: (fc) FileChannel.transferTo throws IOException when position equals size

[Martin Doerr]

Backport of [JDK-8325382](https://bugs.openjdk.org/browse/JDK-8325382).

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Commit messages:
 - Backport 6b7c9718d68f30f47a163042d6e205945b9ff365

Changes: https://git.openjdk.org/jdk21u-dev/pull/631/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=631&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325382
  Stats: 50 lines in 2 files changed: 36 ins; 9 del; 5 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/631.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/631/head:pull/631

PR: https://git.openjdk.org/jdk21u-dev/pull/631