NFSD: Update the NFSv3 READ3res encode to use struct xdr_stream

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
diff --git a/fs/nfsd/xdr3.h b/fs/nfsd/xdr3.h
index 1d633c5..8073350 100644
--- a/fs/nfsd/xdr3.h
+++ b/fs/nfsd/xdr3.h
@@ -145,6 +145,7 @@ struct nfsd3_readres {
 	struct svc_fh		fh;
 	unsigned long		count;
 	__u32			eof;
+	struct page		**pages;
 };
 
 struct nfsd3_writeres {