Staging: iio: Simplify return logic

This patch removes the conditional return of the ade77*_probe functions
based on the return values of iio_device_register as the latter
returns 0 or ret, the same as the checked values.

Warning found by coccinelle.
Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
Reviewed-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/meter/ade7753.c

@@ -517,11 +517,7 @@ static int ade7753_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	ret = iio_device_register(indio_dev);
-	if (ret)
-		return ret;
-
-	return 0;
+	return iio_device_register(indio_dev);
 }
 
 /* fixme, confirm ordering in this function */

drivers/staging/iio/meter/ade7754.c

@@ -540,11 +540,7 @@ static int ade7754_probe(struct spi_device *spi)
 	ret = ade7754_initial_setup(indio_dev);
 	if (ret)
 		return ret;
-	ret = iio_device_register(indio_dev);
-	if (ret)
-		return ret;
-
-	return 0;
+	return iio_device_register(indio_dev);
 }
 
 /* fixme, confirm ordering in this function */

drivers/staging/iio/meter/ade7759.c

@@ -462,11 +462,7 @@ static int ade7759_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	ret = iio_device_register(indio_dev);
-	if (ret)
-		return ret;
-
-	return 0;
+	return iio_device_register(indio_dev);
 }
 
 /* fixme, confirm ordering in this function */