staging: iio: meter: replace ternary operator by if condition

Replace ternary operator by simple if based evaluation of the return
value. Issue identified using coccicheck.
Signed-off-by: NDeepak R Varma <drv@mailo.com>
Link: https://lore.kernel.org/r/Y3CAdCa17WdWDYUa@qemulionSigned-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/meter/ade7854-i2c.c

@@ -61,7 +61,10 @@ static int ade7854_i2c_write_reg(struct device *dev,
 unlock:
 	mutex_unlock(&st->buf_lock);
 
-	return ret < 0 ? ret : 0;
+	if (ret < 0)
+		return ret;
+
+	return 0;
 }
 
 static int ade7854_i2c_read_reg(struct device *dev,