RFR: 8292214: Memory leak in getAllConfigs of awt_GraphicsEnv.c:386

[Alisen Chung]

changed return to cleanup in getAllConfigs
changed cleanup to loop thru and free all allocated memory adjacent to graphicsConfig pointer

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Commit messages:
 - corrected loop thru graphicsConfigs
 - init commit

Changes: https://git.openjdk.org/jdk/pull/10378/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10378&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292214
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10378.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10378/head:pull/10378

PR: https://git.openjdk.org/jdk/pull/10378