bus: move BUS_DONT_DESTROY calls after asserts
It's not useful to bump the reference count before checking if the object is NULL. Thanks to d40f5cc4 we can do this ;). Related to https://bugzilla.redhat.com/show_bug.cgi?id=1576084, https://bugzilla.redhat.com/show_bug.cgi?id=1575340, https://bugzilla.redhat.com/show_bug.cgi?id=1575350. I'm not sure why those two people hit this code path, while most people don't. At least we won't abort.
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