iio: frequency: admv1014: return -EINVAL directly

Remove extra step where the error code is assigned to the `ret`
variable.

Return instead error code directly.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://lore.kernel.org/r/20220819104117.4600-1-antoniu.miclaus@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/frequency/admv1014.c

@@ -669,8 +669,7 @@ static int admv1014_init(struct admv1014_state *st)
 	chip_id = FIELD_GET(ADMV1014_CHIP_ID_MSK, chip_id);
 	if (chip_id != ADMV1014_CHIP_ID) {
 		dev_err(&spi->dev, "Invalid Chip ID.\n");
-		ret = -EINVAL;
-		return ret;
+		return -EINVAL;
 	}
 
 	ret = __admv1014_spi_update_bits(st, ADMV1014_REG_QUAD,