Input: adxl34x - clean up a data type in adxl34x_probe()

The "revid" is used to store negative error codes so it should be an int
type.

Fixes: e27c7292 ("Input: add driver for ADXL345/346 Digital Accelerometers")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Link: https://lore.kernel.org/r/20201026072824.GA1620546@mwanda


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>