crash in dbus-launch

[Ray Strode]

Hi guys,

So while looking at an odd Fedora gnome-session bug:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=214649

I noticed that the dbus-launch babysitter process in 0.94 and later
crashes while trying to initialize its X11 code.

It tries to pre-create some X atoms that the autolaunch bits need even
when not using --autolaunch, and the end result is a null pointer
dereference caused by trying to read the machine uuid that would have
been passed to --autolaunch.

The attached patch seems to fix things by bypassing the atom creation
code in the case where we don't use --autolaunch.

--Ray
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