decref to_return after using it

Author: Nico-Posada

Python/import.c

@@ -3854,15 +3854,17 @@ PyImport_ImportModuleLevelObject(PyObject *name, PyObject *globals,
                 }
 
                 final_mod = import_get_module(tstate, to_return);
-                Py_DECREF(to_return);
                 if (final_mod == NULL) {
                     if (!_PyErr_Occurred(tstate)) {
                         _PyErr_Format(tstate, PyExc_KeyError,
                                       "%R not in sys.modules as expected",
                                       to_return);
                     }
+                    Py_DECREF(to_return);
                     goto error;
                 }
+
+                Py_DECREF(to_return);
             }
         }
         else {