iio: humidity: Drop unnecessary -ENOMEM messages

The drivers do not require their own error messages for error
-ENOMEM, memory allocation failures. So remove the dev_err()
messages from the probe().

Signed-off-by: Dixit Parmar <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/humidity/am2315.c

···
 	struct am2315_data *data;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
-	if (!indio_dev) {
-		dev_err(&client->dev, "iio allocation failed!\n");
+	if (!indio_dev)
 		return -ENOMEM;
-	}
 
 	data = iio_priv(indio_dev);
 	data->client = client;

drivers/iio/humidity/dht11.c

···
 	struct iio_dev *iio;
 
 	iio = devm_iio_device_alloc(dev, sizeof(*dht11));
-	if (!iio) {
-		dev_err(dev, "Failed to allocate IIO device\n");
+	if (!iio)
 		return -ENOMEM;
-	}
 
 	dht11 = iio_priv(iio);
 	dht11->dev = dev;