Typo

src/paho/mqtt/client.py

@@ -3005,7 +3005,7 @@ class Client(object):
                 raise
 
         # If we have an external event loop registered, use that instead
-        # of calling lling loop_write() directly.
+        # of calling loop_write() directly.
         if self._thread is None and self._on_socket_register_write is None:
             if self._in_callback_mutex.acquire(False):
                 self._in_callback_mutex.release()