iio:magn:hmc5843: Fix passing true where iio_shared_by enum required.

So it's obvious that the code is wrong in passing true, but I'm assuming
that will actually evaluate to 1 and hence IIO_SHARED_BY_TYPE.
The documentation however has this attribute as IIO_SHARED_BY_ALL.
My current assumption is the documentation is wrong.
If anyone knows otherwise please shout out!

Fixes: 7247645f ("iio: hmc5843: Move hmc5843 out of staging")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: H. Nikolaus Schaller <hns@goldelico.com>
Link: https://lore.kernel.org/r/20200913112546.715624-1-jic23@kernel.org

drivers/iio/magnetometer/hmc5843_core.c

@@ -245,7 +245,7 @@ static const struct iio_enum hmc5843_meas_conf_enum = {
 };
 
 static const struct iio_chan_spec_ext_info hmc5843_ext_info[] = {
-	IIO_ENUM("meas_conf", true, &hmc5843_meas_conf_enum),
+	IIO_ENUM("meas_conf", IIO_SHARED_BY_TYPE, &hmc5843_meas_conf_enum),
 	IIO_ENUM_AVAILABLE("meas_conf", &hmc5843_meas_conf_enum),
 	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, hmc5843_get_mount_matrix),
 	{ }
@@ -259,7 +259,7 @@ static const struct iio_enum hmc5983_meas_conf_enum = {
 };
 
 static const struct iio_chan_spec_ext_info hmc5983_ext_info[] = {
-	IIO_ENUM("meas_conf", true, &hmc5983_meas_conf_enum),
+	IIO_ENUM("meas_conf", IIO_SHARED_BY_TYPE, &hmc5983_meas_conf_enum),
 	IIO_ENUM_AVAILABLE("meas_conf", &hmc5983_meas_conf_enum),
 	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, hmc5843_get_mount_matrix),
 	{ }