iio:amplifiers:hmc425a: Suppress clang W=1 warning about pointer to enum conversion.

Cast to a uintptr_t rather than directly to the enum.

As per the discussion in below linked media patch.

Link: https://lore.kernel.org/linux-media/CAK8P3a2ez6nEw4d+Mqa3XXAz0RFTZHunqqRj6sCt7Y_Eqqs0rw@mail.gmail.com/
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20211128172445.2616166-6-jic23@kernel.org

drivers/iio/amplifiers/hmc425a.c

@@ -192,7 +192,7 @@ static int hmc425a_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	st = iio_priv(indio_dev);
-	st->type = (enum hmc425a_type)of_device_get_match_data(&pdev->dev);
+	st->type = (uintptr_t)of_device_get_match_data(&pdev->dev);
 
 	st->chip_info = &hmc425a_chip_info_tbl[st->type];
 	indio_dev->num_channels = st->chip_info->num_channels;