usb: chipidea: udc: Don't flush endpoint fifo twice

The endpoint fifo is already flushed in _ep_nuke so there
is no need to flush it twice.
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: NPeter Chen <peter.chen@nxp.com>

drivers/usb/chipidea/udc.c

@@ -121,7 +121,6 @@ static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
  */
 static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
 {
-	hw_ep_flush(ci, num, dir);
 	hw_write(ci, OP_ENDPTCTRL + num,
 		 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
 	return 0;