Bluetooth: SMP: make SM/PER/KDU/BI-04-C happy

The last test step ("Test with Invalid public key X and Y, all set to
0") expects to get an "DHKEY check failed" instead of "unspecified".

Fixes: 6d19628 ("Bluetooth: SMP: Fail if remote and local public keys are identical")
Signed-off-by: Christian Eggers <[email protected]>
Signed-off-by: Luiz Augusto von Dentz <[email protected]>

Author: ceggers-arri

net/bluetooth/smp.c

@@ -2743,7 +2743,7 @@ static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
 	if (!test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags) &&
 	    !crypto_memneq(key, smp->local_pk, 64)) {
 		bt_dev_err(hdev, "Remote and local public keys are identical");
-		return SMP_UNSPECIFIED;
+		return SMP_DHKEY_CHECK_FAILED;
 	}
 
 	memcpy(smp->remote_pk, key, 64);