Remove local variable 'ddp' from DDP's attach and detach routines; they were used only for assertions, and rather than ifdef'ing them INVARIANTS and using local variables, just directly access so_pcb.
Remove local variable 'ddp' from DDP's attach and detach routines; they
were used only for assertions, and rather than ifdef'ing them
INVARIANTS and using local variables, just directly access so_pcb.

Submitted by:	Christoph Mallon <christoph dot mallon at gmx dot de>
MFC after:	1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase