bend_symlinks did not allow whitespace in filename

set -o noglob
find -P $(realpath $FILE_SYSTEM_ROOT) -type l -print0 |
        while ISF= read -r -d '' syml; do
  OLD_TARGET=$(realpath -m "$syml" | sed -n -r "/$REGEX_OLD/p")
  if [ -z "$OLD_TARGET" ] ; then
    # filter non matching
    continue
  fi

• include the code
• write a test
• review and merge @henrik