vlc_object_attach: do not kill an object within the structure lock
Killing a the parent within vlc_object_attach looks like an awful hack anyway. And there was a documented race condition, in addition to the dead lock. This reverts all the pluses from 99e8bcdd. vlc_object_kill() takes the structure lock internally (through vlc_list_child()), so this would always deadlock. Besides, we cannot take any lock within the structure lock, lest we forbid any thread from ever manipulating the objects structure while holding a lock on any object. AFAIK, only object reference spins and the messages bank can be locked within the structure lock.
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