RFR: 8311645: Memory leak in jspawnhelper spawnChild after JDK-8307990

[Jenny Shivayogi]

Free-ing 'buf' before two conditional return statements introduced by JDK-8307990

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Commit messages:
 - removing tab space and resolving merge conflict
 - Merge branch 'openjdk:master' into JDK-8311645
 - removing tab space
 - freeing the buf before return
 - removing tab space

Changes: https://git.openjdk.org/jdk/pull/14809/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14809&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311645
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14809.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14809/head:pull/14809

PR: https://git.openjdk.org/jdk/pull/14809