android/avrcp: Fix warnings when freeing avrcp_device struct
android/avrcp: Fix warnings when freeing avrcp_device struct

If the device does not yet have queue due to not have a session it cause
the following warnings when avrcp_device_free is called:
(bluetoothd:1102): GLib-CRITICAL **: g_queue_foreach: assertion 'queue != NULL' failed
(bluetoothd:1102): GLib-CRITICAL **: g_queue_free: assertion 'queue != NULL' failed

pstglia/external-bluetooth-bluez,ComputeCycles/bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,silent-snowman/bluez,pkarasev3/bluez,mapfau/bluez,ComputeCycles/bluez,silent-snowman/bluez,silent-snowman/bluez,ComputeCycles/bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,ComputeCycles/bluez,silent-snowman/bluez,pkarasev3/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez,pkarasev3/bluez