RFR: 8351010: Test java/io/File/GetXSpace.java failed: / usable space 56380809216 > free space 14912244940

[Brian Burkhalter]

Relax testing the inequality `usable_space <= free_space` to testing the inequality `usable_space <= total_space`.

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Commit messages:
 - 8351010: Test java/io/File/GetXSpace.java failed: / usable space 56380809216 > free space 14912244940

Changes: https://git.openjdk.org/jdk/pull/25704/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25704&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351010
  Stats: 12 lines in 1 file changed: 0 ins; 6 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/25704.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25704/head:pull/25704

PR: https://git.openjdk.org/jdk/pull/25704