manager: fix monitor hotplug segfault
commit e5a0e92f introduced a way to find a user session associated with a display object. That function has a bug in it, where it skips every even registered user session because it follows the next pointer twice per iteration of the loop. This can cause a crash on monitor hotplug, and in other scenarios if there are an odd number of user sessions (since the terminating NULL will be even and skipped over). https://bugzilla.gnome.org/show_bug.cgi?id=749987
parent
4b03eb0f
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