RFR: 8347758: modules.cpp leaks string returned from get_numbered_propert_as_sorted_string()

[Zhengyu Gu]

Modules::get_numbered_property_as_sorted_string() returns strings created from os::strdup(), callers should free them after uses.

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Commit messages:
 - 8347758: modules.cpp leaks string returned from get_numbered_property_as_sorted_string()

Changes: https://git.openjdk.org/jdk/pull/23121/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23121&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347758
  Stats: 9 lines in 1 file changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/23121.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23121/head:pull/23121

PR: https://git.openjdk.org/jdk/pull/23121