RFR: JDK-8318591: avoid leaks in loadlib_aix.cpp reload_table()

[Matthias Baesken]

Seems loaded_module_t* lm is not freed in some special cases in loadlib_aix.cpp reload_table() .

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Commit messages:
 - JDK-8318591

Changes: https://git.openjdk.org/jdk/pull/16285/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16285&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318591
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16285.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16285/head:pull/16285

PR: https://git.openjdk.org/jdk/pull/16285