USB: sierra: remove disconnected test from close

Remove no longer needed disconnected test from close, which is never
called post disconnect (and drivers must handle failed I/O during
disconnect anyway).
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/sierra.c

@@ -772,16 +772,12 @@ static void sierra_close(struct usb_serial_port *port)
 	portdata->rts_state = 0;
 	portdata->dtr_state = 0;
 
-	mutex_lock(&serial->disc_mutex);
-	if (!serial->disconnected) {
 	/* odd error handling due to pm counters */
 	if (!usb_autopm_get_interface(serial->interface))
 		sierra_send_setup(port);
 	else
 		usb_autopm_get_interface_no_resume(serial->interface);
 
-	}
-	mutex_unlock(&serial->disc_mutex);
 	spin_lock_irq(&intfdata->susp_lock);
 	portdata->opened = 0;
 	if (--intfdata->open_ports == 0)