Call bpfattach() correctly from if_ppp.c
Call bpfattach() correctly from if_ppp.c

Submitted by:	Andy Adams <ala@merit.edu>
PR:		18506

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