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defined for an in-use socket. This allows us to eliminate countless tests of whether so_pcb is non-NULL, eliminating dozens of error cases. For now, retain the call to sotryfree() in the uipc_abort() path, but this will eventually move to soabort(). These new assumptions should be largely correct, and will become more so as the socket/pcb reference model is fixed. Removing the notion that so_pcb can be non-NULL is a critical step towards further fine-graining of the UNIX domain socket locking, as the so_pcb reference no longer needs to be protected using locks, instead it is a property of the socket life cycle.
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