Merge branch 'ab/submodule-helper-leakfix'

Merge branch 'ab/submodule-helper-leakfix'

Plugging leaks in submodule--helper.

* ab/submodule-helper-leakfix:
  submodule--helper: fix a configure_added_submodule() leak
  submodule--helper: free rest of "displaypath" in "struct update_data"
  submodule--helper: free some "displaypath" in "struct update_data"
  submodule--helper: fix a memory leak in print_status()
  submodule--helper: fix a leak in module_add()
  submodule--helper: fix obscure leak in module_add()
  submodule--helper: fix "reference" leak
  submodule--helper: fix a memory leak in get_default_remote_submodule()
  submodule--helper: fix a leak with repo_clear()
  submodule--helper: fix "sm_path" and other "module_cb_list" leaks
  submodule--helper: fix "errmsg_str" memory leak
  submodule--helper: add and use *_release() functions
  submodule--helper: don't leak {run,capture}_command() cp.dir argument
  submodule--helper: "struct pathspec" memory leak in module_update()
  submodule--helper: fix most "struct pathspec" memory leaks
  submodule--helper: fix trivial get_default_remote_submodule() leak
  submodule--helper: fix a leak in "clone_submodule"