Staging: iio: return expression instead of return ret

The following Coccinelle script was used to detect this:

@@
local idexpression ret;
expression e;
@@

-ret =
+return
       e;
-return ret;
Signed-off-by: Bo YU <tsu.yubo@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/meter/ade7754.c

@@ -349,9 +349,7 @@ static int ade7754_set_irq(struct device *dev, bool enable)
 	else
 		irqen &= ~BIT(14);
 
-	ret = ade7754_spi_write_reg_16(dev, ADE7754_IRQEN, irqen);
-
-	return ret;
+	return ade7754_spi_write_reg_16(dev, ADE7754_IRQEN, irqen);
 }
 
 /* Power down the device */