bug#57919: xscreensaver 6.04 "Authentication failed" error with correct password

[Nathan Dehnel]

If I attempt to lock the screen, it locks with "xflock" instead of
xscreensaver. If I run "xscreensaver-demo", I get

"The XScreenSaver daemon doesn't seem to be running on display ":1.0".
Launch it now?"

If I click "yes", then xscreensaver starts running when the computer
is locked, but I get "Authentication failed", and I have to switch
TTYs and killall xscreensaver to get back into my desktop.
Config:
  (screen-locker-service xscreensaver "xscreensaver")