XS_MAX_PAYLOAD
xs->xs_emsg.xsm_data = malloc(XS_MAX_PAYLOAD, M_DEVBUF,
xs->xs_emsg.xsm_dlen = XS_MAX_PAYLOAD;
datalen = XS_MAX_PAYLOAD;
if (xsm->xsm_hdr.xmh_len > XS_MAX_PAYLOAD) {
buf = malloc(XS_MAX_PAYLOAD, M_DEVBUF, M_ZERO |
error = xs_getprop(xsc, path, property, buf, XS_MAX_PAYLOAD);
free(buf, M_DEVBUF, XS_MAX_PAYLOAD);