Bluetooth: don't try to cancel uninitialized works at mgmt_index_removed()

syzbot is reporting attempt to cancel uninitialized work at
mgmt_index_removed() [1], for calling cancel_delayed_work_sync() without
INIT_DELAYED_WORK() is not permitted.

INIT_DELAYED_WORK() is called from mgmt_init_hdev() via chan->hdev_init()
 from hci_mgmt_cmd(), but cancel_delayed_work_sync() is unconditionally
called from mgmt_index_removed().

Call cancel_delayed_work_sync() only if HCI_MGMT flag was set, for
mgmt_init_hdev() sets HCI_MGMT flag when calling INIT_DELAYED_WORK().

Link: https://syzkaller.appspot.com/bug?extid=b8ddd338a8838e581b1c [1]
Reported-by: syzbot <syzbot+b8ddd338a8838e581b1c@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 0ef08313 ("Bluetooth: Convert delayed discov_off to hci_sync")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

net/bluetooth/mgmt.c

@@ -8935,6 +8935,8 @@ void mgmt_index_removed(struct hci_dev *hdev)
 			 HCI_MGMT_EXT_INDEX_EVENTS);
 
 	/* Cancel any remaining timed work */
+	if (!hci_dev_test_flag(hdev, HCI_MGMT))
+		return;
 	cancel_delayed_work_sync(&hdev->discov_off);
 	cancel_delayed_work_sync(&hdev->service_cache);
 	cancel_delayed_work_sync(&hdev->rpa_expired);