Bug#322920: Error in postrm: remove_conffile_rollback() declared twice

["Andreas Kuckartz" <A.Kuckartz@ping.de>]

remove_conffile_rollback() is declared twice and the second
"syntax"-comment is wrong:

remove_conffile_rollback () {
  # syntax: remove_conffile_rollback filename

...

remove_conffile_rollback () {
  # syntax: replace_conffile_with_symlink_rollback oldfilename newfilename

Cheers,
Andreas