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, 4 insertions, 4 deletions

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index ced0e6dc179d..64abc5fbf2c1 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -3770,16 +3770,16 @@ static int gsm_modem_update(struct gsm_dlci *dlci, u8 brk)
 	return -EPROTONOSUPPORT;
 }
 
-static int gsm_carrier_raised(struct tty_port *port)
+static bool gsm_carrier_raised(struct tty_port *port)
 {
 	struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port);
 	struct gsm_mux *gsm = dlci->gsm;
 
 	/* Not yet open so no carrier info */
 	if (dlci->state != DLCI_OPEN)
-		return 0;
+		return false;
 	if (debug & DBG_CD_ON)
-		return 1;
+		return true;
 
 	/*
 	 * Basic mode with control channel in ADM mode may not respond
@@ -3787,7 +3787,7 @@ static int gsm_carrier_raised(struct tty_port *port)
 	 */
 	if (gsm->encoding == GSM_BASIC_OPT &&
 	    gsm->dlci[0]->mode == DLCI_MODE_ADM && !dlci->modem_rx)
-		return 1;
+		return true;
 
 	return dlci->modem_rx & TIOCM_CD;
 }