crypto: atmel-sha204a - fix negated return value

Fix negated variable return value.

Fixes: e05ce444 ("crypto: atmel-sha204a - add reading from otp zone")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-crypto/34cd4179-090e-479d-b459-8d0d35dd327d@moroto.mountain/Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/atmel-sha204a.c

@@ -106,7 +106,7 @@ static int atmel_sha204a_otp_read(struct i2c_client *client, u16 addr, u8 *otp)
 
 	if (cmd.data[0] == 0xff) {
 		dev_err(&client->dev, "failed, device not ready\n");
-		return -ret;
+		return -EINVAL;
 	}
 
 	memcpy(otp, cmd.data+1, 4);