serial: max3100: Use uart_xmit_advance()

Take advantage of the new uart_xmit_advance() helper.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20221019091151.6692-21-ilpo.jarvinen@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/max3100.c

@@ -292,9 +292,7 @@ static void max3100_work(struct work_struct *w)
 			} else if (!uart_circ_empty(xmit) &&
 				   !uart_tx_stopped(&s->port)) {
 				tx = xmit->buf[xmit->tail];
-				xmit->tail = (xmit->tail + 1) &
-					(UART_XMIT_SIZE - 1);
-				s->port.icount.tx++;
+				uart_xmit_advance(&s->port, 1);
 			}
 			if (tx != 0xffff) {
 				max3100_calc_parity(s, &tx);