iio: dht11: avoid multiple assignments to make checkpatch.pl --strict happy

We just do the assignments in two steps.

Signed-off-by: Harald Geyer <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/humidity/dht11.c

···
 	dht11 = iio_priv(iio);
 	dht11->dev = dev;
 
-	dht11->gpio = ret = of_get_gpio(node, 0);
+	ret = of_get_gpio(node, 0);
 	if (ret < 0)
 		return ret;
+	dht11->gpio = ret;
 	ret = devm_gpio_request_one(dev, dht11->gpio, GPIOF_IN, pdev->name);
 	if (ret)
 		return ret;