Merge branch 'js/misc-fixes'

Assorted fixes to problems found by Coverity.

* js/misc-fixes:
  relative_url(): fix incorrect condition
  pack-mtimes: avoid closing a bogus file descriptor
  read_index_from(): avoid memory leak
  submodule--helper: avoid memory leak when fetching submodules
  submodule-config: avoid memory leak
  fsmonitor: avoid memory leak in `fsm_settings__get_incompatible_msg()`