This code had several wrongs here:
- The tracker_file_system_is_file_interned got the check_fs
  parameter wrong, creating an additional copy of the file.
  This would be inocuous as the later lookup would succeed,
  except
- The extra copy of the file was being leaked
- And actually the later lookup is somewhat superfluous if
  we are checking the NodeLookupData. We can shortcircuit
  lookup of files already interned in this TrackerFileSystem
  even further.

This all is fixed now, the tracker_file_system_is_file_interned()
function got open coded in the caller function so we can perform
the fast path, the check has been corrected, and even if we would
fall through the paths that do need a copy, it wouldn't be leaked.