A recent version of the oldnfs NFS client in head/current will crash when doing a large write, since m_get2() would return NULL. This patch fixes the problem, since nfsm_uiotombuf() will allocate additional mbufs, as required.
A recent version of the oldnfs NFS client in head/current
will crash when doing a large write, since m_get2() would
return NULL. This patch fixes the problem, since nfsm_uiotombuf()
will allocate additional mbufs, as required.

Reported by:	sbruno
Tested by:	sbruno
Discussed with:	glebius

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