Remove use of Giant around vn_open() in audit trail setup.
Remove use of Giant around vn_open() in audit trail setup.

Submitted by:	jhb, wsalamon
Obtained from:	TrustedBSD Project

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