staging: iio: adis16060: Fix coding style problem

This patch fixes a warning from checkpatch.pl script :
"WARNING: Missing a blank line after declarations"
Signed-off-by: Oussama Jabbari <oussama.jabbari@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/gyro/adis16060_core.c

@@ -180,6 +180,7 @@ static int adis16060_w_probe(struct spi_device *spi)
 	int ret;
 	struct iio_dev *indio_dev = adis16060_iio_dev;
 	struct adis16060_state *st;
+
 	if (!indio_dev) {
 		ret =  -ENODEV;
 		goto error_ret;