Bluetooth: Fix possible infinite recursion of btusb_reset

The function enters infinite recursion if the HCI device doesn't support
GPIO reset: btusb_reset -> hdev->reset -> vendor_reset -> btusb_reset...

btusb_reset shouldn't call hdev->reset after commit f07d478
("Bluetooth: Get rid of cmd_timeout and use the reset callback")

Fixes: f07d478 ("Bluetooth: Get rid of cmd_timeout and use the reset callback")
Signed-off-by: Hsin-chen Chuang <chharry@chromium.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

drivers/bluetooth/btusb.c

@@ -899,11 +899,6 @@ static void btusb_reset(struct hci_dev *hdev)
 	struct btusb_data *data;
 	int err;
 
-	if (hdev->reset) {
-		hdev->reset(hdev);
-		return;
-	}
-
 	data = hci_get_drvdata(hdev);
 	/* This is not an unbalanced PM reference since the device will reset */
 	err = usb_autopm_get_interface(data->intf);