[issue1806] DFBSD 2.7.3 - mbuf exhausted while rsync to a NFS

[Matthew Dillon]

    Ok, this should be fixed now.  nfs_realign() was calling m_copyback()
    which was allocating the mbuf chain using normal mbufs instead of
    cluster bufs, causing the normal mbufs to get blown out on machines
    with low amounts of memory.

						-Matt