[PATCH] serial: mctrl_gpio: Fix passing zero to 'ERR_PTR' warning

[YueHaibing]

drivers/tty/serial/serial_mctrl_gpio.c:214
 mctrl_gpio_init() warn: passing zero to 'ERR_PTR'

gpiod_to_irq() never return 0, so remove the useless test
and make code more clear.

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/tty/serial/serial_mctrl_gpio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/serial_mctrl_gpio.c 
b/drivers/tty/serial/serial_mctrl_gpio.c
index fb4781292d40..c41d8911ce95 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -207,7 +207,7 @@ struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, 
unsigned int idx)
                        continue;
 
                ret = gpiod_to_irq(gpios->gpio[i]);
-               if (ret <= 0) {
+               if (ret < 0) {
                        dev_err(port->dev,
                                "failed to find corresponding irq for %s 
(idx=%d, err=%d)\n",
                                mctrl_gpios_desc[i].name, idx, ret);
-- 
2.17.1