extmod/uasyncio: Use .errno instead of .args[0] for OSError exceptions.

Signed-off-by: Damien George <damien@micropython.org>

extmod/uasyncio/stream.py

@@ -82,7 +82,7 @@ async def open_connection(host, port):
     try:
         s.connect(ai[-1])
     except OSError as er:
-        if er.args[0] != EINPROGRESS:
+        if er.errno != EINPROGRESS:
             raise er
     yield core._io_queue.queue_write(s)
     return ss, ss