Fix _check_resolved_address() for IPv6 address

Author: vstinner

asyncio/base_events.py

@@ -45,10 +45,13 @@ def _check_resolved_address(sock, address):
     # Ensure that the address is already resolved to avoid the trap of hanging
     # the entire event loop when the address requires doing a DNS lookup.
     family = sock.family
-    if family not in (socket.AF_INET, socket.AF_INET6):
+    if family == socket.AF_INET:
+        host, port = address
+    elif family == socket.AF_INET6:
+        host, port, flow_info, scope_id = address
+    else:
         return
 
-    host, port = address
     type_mask = 0
     if hasattr(socket, 'SOCK_NONBLOCK'):
         type_mask |= socket.SOCK_NONBLOCK