drv-iio-poll-proximity: change near criterion
Change the near
level comparison to a greater-than-or-equal-to to make
the calculation match the kernel documentation.
See: https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-bus-iio-proximity
The current code seems to abide to the old comment in systemd's hwdb/60-sensor.hwdb
,
but not to the kernel documentation for in_proximity_nearlevel
as outlined in the
kernel documentation.
This is based on the change in documentation I proposed to systemd's hwdb. See: https://github.com/systemd/systemd/issues/25793
A sensor reporting binary values 0/1 to indicate far/near would currently need a
PROXIMITY_NEAR_LEVEL
of 0 which is additionally problematic as a value of 0 is also
reported by g_udev_device_get_property_as_int
/g_udev_device_get_sysfs_attr_as_int
or when the attribute/property query fails.
Fixes: #361