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: e27c729 ("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>

drivers/input/misc/adxl34x.c

@@ -696,7 +696,7 @@ struct adxl34x *adxl34x_probe(struct device *dev, int irq,
 	struct input_dev *input_dev;
 	const struct adxl34x_platform_data *pdata;
 	int err, range, i;
-	unsigned char revid;
+	int revid;
 
 	if (!irq) {
 		dev_err(dev, "no IRQ?\n");