Return nfserr_nofilehandle (v4 only) in fh_verify() if the filehandle
has not been set.

--- old/fs/nfsd/nfsfh.c	Sun Aug 11 22:53:39 2002
+++ new/fs/nfsd/nfsfh.c	Sun Aug 11 22:54:13 2002
@@ -109,6 +109,8 @@ fh_verify(struct svc_rqst *rqstp, struct
 		error = nfserr_stale;
 		if (rqstp->rq_vers > 2)
 			error = nfserr_badhandle;
+		if (rqstp->rq_vers == 4 && fh->fh_size == 0)
+			return nfserr_nofilehandle;
 
 		if (fh->fh_version == 1) {
 			datap = fh->fh_auth;