iio: inkern: fix iio_convert_raw_to_processed_unlocked

When reading IIO_CHAN_INFO_OFFSET, the return value of iio_channel_read() for
success will be IIO_VAL*, checking for 0 is not correct.

Without this fix the offset applied by iio drivers will be ignored when
converting a raw value to one in appropriate base units (e.g mV) in
a IIO client drivers that use iio_convert_raw_to_processed including
iio-hwmon.

Cc: <[e-mail]> # 3.10.x
Signed-off-by: Alexandre Belloni <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/inkern.c

···
 	int ret;
 
 	ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_OFFSET);
-	if (ret == 0)
+	if (ret >= 0)
 		raw64 += offset;
 
 	scale_type = iio_channel_read(chan, &scale_val, &scale_val2,