c9f14e5e97
random_mutex is locked, because * a cancellation point may occur during fprintf(), and no cancellation handler had been installed, and * the XSH5 specifcation of these functions does not permit output to stderr. Therefore, in initstate() and setstate(), return a null pointer if the supplied state is not valid. This also fixes a bug in setstate() which caused corrupt state information being used despite printing an error message.