When aborting tcp_attach() due to a problem allocating or attaching the tcpcb, lock the inpcb before calling in_pcbdetach() or in6_pcbdetach(), as they expect the inpcb to be passed locked.
When aborting tcp_attach() due to a problem allocating or attaching the
tcpcb, lock the inpcb before calling in_pcbdetach() or in6_pcbdetach(),
as they expect the inpcb to be passed locked.

MFC after:	7 days

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