Change some comments.

Author: ZeroIntensity

Python/pylifecycle.c

@@ -3472,6 +3472,7 @@ wait_for_native_shutdown(PyInterpreterState *interp)
     struct _Py_finalizing_threads *finalizing = &interp->threads.finalizing;
     PyMutex_Lock(&finalizing->mutex);
     if (finalizing->countdown == 0) {
+        // Nothing to do.
         PyMutex_Unlock(&finalizing->mutex);
         return;
     }

Python/pystate.c

@@ -3292,8 +3292,9 @@ PyThreadState_Ensure(PyInterpreterState *interp)
     }
     PyThreadState *save = _PyThreadState_GET();
     if (save != NULL && save->interp == interp) {
+        /* We already have a thread state that matches the
+           interpreter. */
         Py_ssize_t refcnt = decref_interpreter(interp);
-        assert(refcnt > 1);
         entry->was_daemon = save->daemon;
         entry->next = save->ensured;
         entry->prior_tstate = NULL;