serial: max310x: fix indentation

Fix indentation and add line after do/while() block.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20240118152213.2644269-18-hugo@hugovil.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/max310x.c

@@ -802,6 +802,7 @@ static irqreturn_t max310x_port_irq(struct max310x_port *s, int portno)
 		if (ists & MAX310X_IRQ_TXEMPTY_BIT)
 			max310x_start_tx(port);
 	} while (1);
+
 	return res;
 }