When removing a sillyrename file, make sure that the directory vnode has not been cleaned in the meantime, since this can happen during a forced unmount. Also add a comment that nfs_removeit() should really be locking the directory vnode before calling nfs_removerpc().
When removing a sillyrename file, make sure that the directory vnode
has not been cleaned in the meantime, since this can happen during
a forced unmount. Also add a comment that nfs_removeit() should
really be locking the directory vnode before calling nfs_removerpc().

Reported by:	mbr
Tested by:	mbr
MFC after:	1 week

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