Bluetooth: Controller: Handle return value of ll_deinit()

This call may fail. Handling the return value makes it easier
to catch bugs.

Signed-off-by: Rubin Gerritsen <[email protected]>

Author: rugeGerritsen

subsys/bluetooth/controller/hci/hci_driver.c

@@ -881,10 +881,12 @@ static int hci_driver_open(const struct device *dev, bt_hci_recv_t recv)
 
 static int hci_driver_close(const struct device *dev)
 {
+	int err;
 	struct hci_driver_data *data = dev->data;
 
 	/* Resetting the LL stops all roles */
-	ll_deinit();
+	err = ll_deinit();
+	LL_ASSERT(!err);
 
 	/* Abort prio RX thread */
 	k_thread_abort(&prio_recv_thread_data);