Comment 22 for bug 1647485

My pull request has been merged upstream, the commits are:

0a10235 udev-rules: perform whitespace replacement for symlink subst values
e20a917 udev-event: add replace_whitespace param to udev_event_apply_format
a9d99b3 libudev-util: change util_replace_whitespace to return number of chars in dest

from https://github.com/systemd/systemd.git