ws2_32: Set Information to 0 upon completion of an async shutdown.

dlls/ws2_32/socket.c

@@ -1503,6 +1503,7 @@ static NTSTATUS WS2_async_shutdown( void* user, PIO_STATUS_BLOCK iosb, NTSTATUS
         break;
     }
     iosb->u.Status = status;
+    iosb->Information = 0;
     *apc = ws2_async_apc;
     return status;
 }