iio: chemical: bme680: Make error checks consistent

In the majority of the error checks after a regmap_{read,write}()
operation the following coding style is used:

	ret = regmap_{read,write}(data->regmap, ...);
	if (ret < 0) {
		dev_err(dev, ...);
		return ret;
	}

In this particular case it was different so change it for consistency.

Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
Link: https://patch.msgid.link/20240609233826.330516-11-vassilisamir@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>