USB: ftdi_sio: fix error message on close

Resubmitting read urb fails with -EPERM if completion handler runs while
urb is being killed on close. This should not be reported as an error.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/ftdi_sio.c

@@ -1720,7 +1720,7 @@ static int ftdi_submit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
 			   urb->transfer_buffer_length,
 			   ftdi_read_bulk_callback, port);
 	result = usb_submit_urb(urb, mem_flags);
-	if (result)
+	if (result && result != -EPERM)
 		dev_err(&port->dev,
 			"%s - failed submitting read urb, error %d\n",
 							__func__, result);