svnrdump: dump_editor: Avoid duplicating strings unnecessarily
svnrdump: dump_editor: Avoid duplicating strings unnecessarily

* subversion/svnrdump/dump_editor.c

  (open_directory, close_directory, make_dir_baton): Instead of first
  allocating `copyfrom_path` in `pool` and then copying it to
  `eb->pool`, allocate it in `eb->pool` in the first place.

  (make_dir_baton): Don't unnecessarily copy a simple static string:
  let `abspath` point to a static string if `pb` does not exist.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion