MFC 1.40: when doing s/w crypto make sure work is done w/ a writable     mbuf chain; this corrects problems with drivers that rely on the     host to do crypto
MFC 1.40: when doing s/w crypto make sure work is done w/ a writable
    mbuf chain; this corrects problems with drivers that rely on the
    host to do crypto

Approved by:	re (hrs)

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