Raise a value error on bad compression level

Author: rhpvorderman

src/zlib_ng/zlib_ngmodule.c

@@ -1653,7 +1653,7 @@ ParallelCompress__new__(PyTypeObject *type, PyObject *args, PyObject *kwargs)
         Py_DECREF(self);
         return NULL;
     case Z_STREAM_ERROR:
-        PyErr_SetString(ZlibError, "Bad compression level");
+        PyErr_SetString(PyExc_ValueError, "Bad compression level");
         Py_DECREF(self);
         return NULL;
     default: