serial: st-asc: Avoid using irq_wake flag

There is no need to duplicate a flag which IRQ core takes care of.

Replace custom flag by IRQ core API that retrieves its state.

Cc: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/st-asc.c

@@ -310,7 +310,7 @@ static void asc_receive_chars(struct uart_port *port)
 	if (mode == ASC_CTL_MODE_8BIT || mode == ASC_CTL_MODE_8BIT_PAR)
 		ignore_pe = true;
 
-	if (port->irq_wake)
+	if (irqd_is_wakeup_set(irq_get_irq_data(port->irq)))
 		pm_wakeup_event(tport->tty->dev, 0);
 
 	while ((status = asc_in(port, ASC_STA)) & ASC_STA_RBF) {