staging:iio:magnetometer:ak8975: Fix probe() error-handling

Fix ak8975_probe() to jump to the appropriate exit labels when an error
occurs. With the previous code, some cleanup actions were being skipped
for some error conditions.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Andrew Chew <achew@nvidia.com>
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/magnetometer/ak8975.c

@@ -513,7 +513,7 @@ static int ak8975_probe(struct i2c_client *client,
 	err = ak8975_setup(client);
 	if (err < 0) {
 		dev_err(&client->dev, "AK8975 initialization fails\n");
-		goto exit_gpio;
+		goto exit_free_iio;
 	}
 
 	i2c_set_clientdata(client, indio_dev);