i2c: designware: make use of devm_gpiod_get_optional

There is a semantical change: if devm_gpiod_get_optional returns -ENOSYS
this is passed as error to the caller. This effectively reverts commit
d1fa74520d ("i2c: designware: Consider SCL GPIO optional") which
shouldn't be necessary any more since gpiod_get_optional doesn't return
-ENOSYS any more with GPIOLIB=n.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-designware-master.c

@@ -657,13 +657,10 @@ static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev)
 	struct gpio_desc *gpio;
 	int r;
 
-	gpio = devm_gpiod_get(dev->dev, "scl", GPIOD_OUT_HIGH);
-	if (IS_ERR(gpio)) {
-		r = PTR_ERR(gpio);
-		if (r == -ENOENT || r == -ENOSYS)
-			return 0;
-		return r;
-	}
+	gpio = devm_gpiod_get_optional(dev->dev, "scl", GPIOD_OUT_HIGH);
+	if (IS_ERR_OR_NULL(gpio))
+		return PTR_ERR_OR_ZERO(gpio);
+
 	rinfo->scl_gpiod = gpio;
 
 	gpio = devm_gpiod_get_optional(dev->dev, "sda", GPIOD_IN);