iio: accel: st_sensors: Stop copying channels

The channels were copied only so that the .ext_info member should become
assignable. We now have compile-time static assignment so drop this code.

Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Denis Ciocca <denis.ciocca@st.com>
Cc: Daniel Drake <drake@endlessm.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210518230722.522446-3-linus.walleij@linaro.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/st_accel_core.c

@@ -1339,8 +1339,6 @@ int st_accel_common_probe(struct iio_dev *indio_dev)
 {
 	struct st_sensor_data *adata = iio_priv(indio_dev);
 	struct st_sensors_platform_data *pdata = dev_get_platdata(adata->dev);
-	struct iio_chan_spec *channels;
-	size_t channels_size;
 	int err;
 
 	indio_dev->modes = INDIO_DIRECT_MODE;
@@ -1351,15 +1349,9 @@ int st_accel_common_probe(struct iio_dev *indio_dev)
 		return err;
 
 	adata->num_data_channels = ST_ACCEL_NUMBER_DATA_CHANNELS;
+	indio_dev->channels = adata->sensor_settings->ch;
 	indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
 
-	channels_size = indio_dev->num_channels * sizeof(struct iio_chan_spec);
-	channels = devm_kmemdup(&indio_dev->dev,
-				adata->sensor_settings->ch,
-				channels_size, GFP_KERNEL);
-	if (!channels)
-		return -ENOMEM;
-
 	/*
 	 * First try specific ACPI methods to retrieve orientation then try the
 	 * generic function.
@@ -1371,7 +1363,6 @@ int st_accel_common_probe(struct iio_dev *indio_dev)
 			return err;
 	}
 
-	indio_dev->channels = channels;
 	adata->current_fullscale = &adata->sensor_settings->fs.fs_avl[0];
 	adata->odr = adata->sensor_settings->odr.odr_avl[0].hz;