From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Tue, 26 Oct 2021 10:04:26 +0200

If CONSOLE_POLL=n, CONFIG_SERIAL_SUNZILOG_CONSOLE=n, and CONFIG_SERIO=m:

    drivers/tty/serial/sunzilog.c:1128:13: error: ‘sunzilog_putchar’ defined but not used [-Werror=unused-function]
     1128 | static void sunzilog_putchar(struct uart_port *port, int ch)
	  |             ^~~~~~~~~~~~~~~~

Fix this by marking sunzilog_putchar() __maybe_unused.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Acked-by: David S. Miller <davem@davemloft.net>