Bluetooth: Fix hci_update_random_address() error return for no crypto

If the AES crypto context is not available we cannot generate new RPAs.
We should therefore cleanly return an error from the function
responsible for updating the random address.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/hci_core.c

@@ -3882,6 +3882,12 @@ int hci_update_random_address(struct hci_request *req, bool require_privacy,
 		    !bacmp(&hdev->random_addr, &hdev->rpa))
 			return 0;
 
+		if (!hdev->tfm_aes) {
+			BT_ERR("%s crypto not available to generate RPA",
+			       hdev->name);
+			return -EOPNOTSUPP;
+		}
+
 		err = smp_generate_rpa(hdev->tfm_aes, hdev->irk, &hdev->rpa);
 		if (err < 0) {
 			BT_ERR("%s failed to generate new RPA", hdev->name);