xdr_callhdr
extern bool_t xdr_callhdr(XDR *, struct rpc_msg *);
PROTO_NORMAL(xdr_callhdr);
if (!xdr_callhdr(xdrs, &call_msg))
if (! xdr_callhdr(&(ct->ct_xdrs), &call_msg)) {
if (!xdr_callhdr(&(args->cu->cu_outxdrs), &args->call_msg))
DEF_WEAK(xdr_callhdr);
if (!xdr_callhdr(&msg_xdr, mp))