Merge branch 'jk/incore-lockfile-removal'

The long-standing rule that an in-core lockfile instance, once it
is used, must not be freed, has been lifted and the lockfile and
tempfile APIs have been updated to reduce the chance of programming
errors.

* jk/incore-lockfile-removal:
  stop leaking lock structs in some simple cases
  ref_lock: stop leaking lock_files
  lockfile: update lifetime requirements in documentation
  tempfile: auto-allocate tempfiles on heap
  tempfile: remove deactivated list entries
  tempfile: use list.h for linked list
  tempfile: release deactivated strbufs instead of resetting
  tempfile: robustify cleanup handler
  tempfile: factor out deactivation
  tempfile: factor out activation
  tempfile: replace die("BUG") with BUG()
  tempfile: handle NULL tempfile pointers gracefully
  tempfile: prefer is_tempfile_active to bare access
  lockfile: do not rollback lock on failed close
  tempfile: do not delete tempfile on failed close
  always check return value of close_tempfile
  verify_signed_buffer: prefer close_tempfile() to close()
  setup_temporary_shallow: move tempfile struct into function
  setup_temporary_shallow: avoid using inactive tempfile
  write_index_as_tree: cleanup tempfile on error

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