LIBSFF_KEY_EXT_SPEC
return (nvlist_add_string(nvl, LIBSFF_KEY_EXT_SPEC, str));
LIBSFF_KEY_EXT_SPEC, strerror(ret));
if ((ret = nvlist_lookup_string(nvl, LIBSFF_KEY_EXT_SPEC,
"value %d: %s", LIBSFF_KEY_EXT_SPEC, i,