Merge branch 'ab/mark-leak-free-tests-more'

Merge branch 'ab/mark-leak-free-tests-more'

Bunch of tests are marked as "passing leak check".

* ab/mark-leak-free-tests-more:
  merge: add missing strbuf_release()
  ls-files: add missing string_list_clear()
  ls-files: fix a trivial dir_clear() leak
  tests: fix test-oid-array leak, test in SANITIZE=leak
  tests: fix a memory leak in test-oidtree.c
  tests: fix a memory leak in test-parse-options.c
  tests: fix a memory leak in test-prio-queue.c