drivers: iio: adc: ltc2497: fix LSB shift

Correct the "sub_lsb" shift for the ltc2497 and drop the sub_lsb element
which is now constant.

An earlier version of the code shifted by 14 but this was a consequence
of reading three bytes into a __be32 buffer and using be32_to_cpu(), so
eight extra bits needed to be skipped. Now we use get_unaligned_be24()
and thus the additional skip is wrong.

Fixes: 2187cfeb3626 ("drivers: iio: adc: ltc2497: LTC2499 support")
Signed-off-by: Ian Ray <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Cc: <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/ltc2497.c

···
 	struct ltc2497core_driverdata common_ddata;
 	struct i2c_client *client;
 	u32 recv_size;
-	u32 sub_lsb;
 	/*
 	 * DMA (thus cache coherency maintenance) may require the
 	 * transfer buffers to live in their own cache lines.
···
 		 * equivalent to a sign extension.
 		 */
 		if (st->recv_size == 3) {
-			*val = (get_unaligned_be24(st->data.d8) >> st->sub_lsb)
+			*val = (get_unaligned_be24(st->data.d8) >> 6)
 				- BIT(ddata->chip_info->resolution + 1);
 		} else {
-			*val = (be32_to_cpu(st->data.d32) >> st->sub_lsb)
+			*val = (be32_to_cpu(st->data.d32) >> 6)
 				- BIT(ddata->chip_info->resolution + 1);
 		}
 
···
 	st->common_ddata.chip_info = chip_info;
 
 	resolution = chip_info->resolution;
-	st->sub_lsb = 31 - (resolution + 1);
 	st->recv_size = BITS_TO_BYTES(resolution) + 1;
 
 	return ltc2497core_probe(dev, indio_dev);