tty: Convert ->carrier_raised() and callchains to bool

Return boolean from ->carrier_raised() instead of 0 and 1. Make the
return type change also to tty_port_carrier_raised() that makes the
->carrier_raised() call (+ cd variable in moxa into which its return
value is stored).

Also cleans up a few unnecessary constructs related to this change:

	return xx ? 1 : 0;
	-> return xx;

	if (xx)
		return 1;
	return 0;
	-> return xx;

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # For MMC
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230117090358.4796-7-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 460d33a1e70b..01c4fd3ce7c8 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1454,7 +1454,7 @@ static const struct tty_operations serial_ops = {
 	.proc_show = rs_proc_show,
 };
 
-static int amiga_carrier_raised(struct tty_port *port)
+static bool amiga_carrier_raised(struct tty_port *port)
 {
 	return !(ciab.pra & SER_DCD);
 }