device: Fix invalid D-Bus calls during Reverse GATT Discovery
device: Fix invalid D-Bus calls during Reverse GATT Discovery

There is no D-Bus client active during Reverse GATT Discovery, therefore
BlueZ should not send any D-Bus replies. This fixes errors reported by
D-Bus internal checks:

process 453: arguments to dbus_message_new_method_return() were
incorrect, assertion "method_call != NULL" failed in file dbus-message.c
line 1111.

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