audio: Fix gateway in connecting state forever
audio: Fix gateway in connecting state forever

If bt_search_service() fails the state should be left unchanged.
Otherwise the gateway state is set forever to GATEWAY_STATE_CONNECTING.

This issue can be easily reproduced if a connection attempt is done
very soon after startup.

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