RFR: 8309216: Cast from jchar* to char* in test java/io/GetXSpace.java [v2]

[Brian Burkhalter]

> For Unix, copy the `jchar`s into an allocated `char` array.

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

  8309216: Reformat malloc size calculation

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14276/files
  - new: https://git.openjdk.org/jdk/pull/14276/files/fb730a18..18506101

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14276&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14276&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14276.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14276/head:pull/14276

PR: https://git.openjdk.org/jdk/pull/14276