iio: core: remove padding from private information

There was a recent discussion about this code:
  https://lore.kernel.org/linux-iio/20200322165317.0b1f0674@archlinux/

This looks like a good time to removed this, since any issues about it
should pop-up under testing, because the iio_dev is having a bit of an
overhaul and stuff being moved to iio_dev_opaque.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/industrialio-core.c

@@ -1507,8 +1507,6 @@ struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
 		alloc_size = ALIGN(alloc_size, IIO_ALIGN);
 		alloc_size += sizeof_priv;
 	}
-	/* ensure 32-byte alignment of whole construct ? */
-	alloc_size += IIO_ALIGN - 1;
 
 	iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
 	if (!iio_dev_opaque)