tty: mmc: sdio: use bool for cts and remove parentheses

'cts' in sdio_uart_check_modem_status() is considered a 'bool', but
typed as signed 'int'. Make it 'bool' so it is clear the code does not
care about the masked value, but true/false.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250317070046.24386-18-jirislaby@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: Jiri Slaby (SUSE)

drivers/mmc/core/sdio_uart.c

@@ -471,7 +471,7 @@ static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
 		port->icount.cts++;
 		tty = tty_port_tty_get(&port->port);
 		if (tty && C_CRTSCTS(tty)) {
-			int cts = (status & UART_MSR_CTS);
+			bool cts = status & UART_MSR_CTS;
 			if (tty->hw_stopped) {
 				if (cts) {
 					tty->hw_stopped = false;