MFC:	sys/nfsserver/nfs_serv.c	1.167
MFC:	sys/nfsserver/nfs_serv.c	1.167

Protect nfsm_srvpathsiz() call with the nfsd_mtx lock.

Reviewed by:	mohans
Requested by:	kib

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