another missing revert

Author: vladak

adafruit_minimqtt/adafruit_minimqtt.py

@@ -909,10 +909,11 @@ def unsubscribe(self, topic: str) -> None:
                         if self.on_unsubscribe is not None:
                             self.on_unsubscribe(self, self._user_data, t, self._pid)
                         self._subscribed_topics.remove(t)
-                else:
-                    raise MMQTTException(
-                        f"invalid message received as response to UNSUBSCRIBE: {hex(op)}"
-                    )
+                    return
+
+                raise MMQTTException(
+                    f"invalid message received as response to UNSUBSCRIBE: {hex(op)}"
+                )
 
     def _recompute_reconnect_backoff(self) -> None:
         """