dbus: fix shutdown during cycle collection
dbus: fix shutdown during cycle collection

The event module might not be freed if a dbus connection is collected by
the cycle collector. Fortunately we know we can't be in dbus_dispatch in
this case so we can free the connection directly.

Signed-off-by: Yuxuan Shui <7f7e1535bcd10fa942d56a3436533af20f33203f@gmail.com>

yshui/deai,yshui/deai,yshui/deai