Input: adp5588-keys - fix check on return code

During adp5588_setup(), we read all the events to clear the event FIFO.
However, adp5588_read() just calls i2c_smbus_read_byte_data() which
returns the byte read in case everything goes well. Hence, we need to
explicitly check for a negative error code instead of checking for
something different than 0.

Fixes: e960309 ("Input: adp5588-keys - bail out on returned error")
Cc: [email protected]
Signed-off-by: Nuno Sa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: nunojsa

drivers/input/keyboard/adp5588-keys.c

@@ -627,7 +627,7 @@ static int adp5588_setup(struct adp5588_kpad *kpad)
 
 	for (i = 0; i < KEYP_MAX_EVENT; i++) {
 		ret = adp5588_read(client, KEY_EVENTA);
-		if (ret)
+		if (ret < 0)
 			return ret;
 	}