device: Fix pairing has failed due to the error of Already Paired (0x13)

After connect the Bluetooth mouse, open two Bluetoothctl at the same time, when remove the mouse, quickly go to power off,
try to paired the mouse again when I was power on,
found that the error 0x13 was always reported.
try to connect directly,can connect successfully.
but use the info command to query the information of the mouse and find that the pairing status of the mouse is No.
so I try to delete the paired information in the kernel through the "* cancel_pairing()" interface.

---
 src/device.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

index 6da5c380b..f3ce55eff 100644
@@ -3106,8 +3106,11 @@ static DBusMessage *cancel_pairing(DBusConnection *conn, DBusMessage *msg,
 
 	DBG("");
 
-	if (!req)
+	if (!req) {
+		btd_adapter_remove_bonding(device->adapter, &device->bdaddr,
+						device->bdaddr_type);
 		return btd_error_does_not_exist(msg);
+	}
 
 	device_cancel_bonding(device, MGMT_STATUS_CANCELLED);
 

2.20.1

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Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list. This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=639955

---Test result---

Test Summary:

CheckPatch                    PASS      1.40 seconds
GitLint                       PASS      1.03 seconds
Prep - Setup ELL              PASS      53.23 seconds
Build - Prep                  PASS      0.85 seconds
Build - Configure             PASS      10.89 seconds
Build - Make                  PASS      1805.67 seconds
Make Check                    PASS      12.83 seconds
Make Check w/Valgrind         PASS      537.08 seconds
Make Distcheck                PASS      282.72 seconds
Build w/ext ELL - Configure   PASS      10.84 seconds
Build w/ext ELL - Make        PASS      1707.43 seconds
Incremental Build with patchesPASS      0.00 seconds

---
Regards,
Linux Bluetooth