- T((T_CALLED("_nc_add_to_try(%p, %s, %u)"), *tree, _nc_visbuf(str), code));
- if (txt == 0 || *txt == '\0' || code == 0)
+ T((T_CALLED("_nc_add_to_try(%p, %s, %u)"),
+ (void *) *tree, _nc_visbuf(str), code));
+ if (!VALID_STRING(str) || *txt == '\0' || code == 0)