RFR: 8305596: (fc) Two java/nio/channels tests fail after JDK-8303260 [v2]

[Brian Burkhalter]

> Update the tests to conform to the specification change in  [JDK-8303260](https://bugs.openjdk.org/browse/JDK-8303260) which allows writing to a position beyond the channel's size in `FileChannel::transferFrom`.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8305596: Fix size check

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13342/files
  - new: https://git.openjdk.org/jdk/pull/13342/files/d7a843b6..6c138ef1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13342&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13342&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13342.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13342/head:pull/13342

PR: https://git.openjdk.org/jdk/pull/13342