input: Fix crash on authorization reply with first sixaxis connection
input: Fix crash on authorization reply with first sixaxis connection

Bogus unref in sixaxis_sdp_cb was resulting in NULL pointer dereference when
auth_callback was called.

src/adapter.c:connected_callback() hci0 device 00:06:F7:57:08:9E
    connected eir_len 5
src/device.c:device_set_class() /org/bluez/hci0/dev_00_06_F7_57_08_9E
    0x000508
profiles/input/server.c:connect_event_cb() Incoming connection from
    00:06:F7:57:08:9E on PSM 17
profiles/input/device.c:input_device_set_channel() idev (nil) psm 17
profiles/input/server.c:confirm_event_cb()
src/agent.c:agent_ref() 0x8117eb8: ref=2
src/agent.c:agent_authorize_service() authorize service request was
    sent for /org/bluez/hci0/dev_00_06_F7_57_08_9E
src/device.c:device_probe_profiles() Probing profiles for device
    00:06:F7:57:08:9E
profiles/input/device.c:input_device_register()
    /org/bluez/hci0/dev_00_06_F7_57_08_9E
src/service.c:btd_service_ref() 0x811f580: ref=2
src/service.c:change_state() 0x811f580: device 00:06:F7:57:08:9E
    profile input-hid state changed: unavailable -> disconnected (0)
src/device.c:device_svc_resolved()
    /org/bluez/hci0/dev_00_06_F7_57_08_9E err 0
profiles/input/server.c:sixaxis_sdp_cb() err 0 (Success)
profiles/input/device.c:input_device_set_channel() idev 0x8118568 psm
    17
profiles/input/server.c:connect_event_cb() Incoming connection from
    00:06:F7:57:08:9E on PSM 19
profiles/input/device.c:input_device_set_channel() idev 0x8118568 psm
    19
src/service.c:change_state() 0x811f580: device 00:06:F7:57:08:9E
    profile input-hid state changed: disconnected -> connected (0)
sixaxis: compatible device connected: PLAYSTATION(R)3 Controller
    (054C:0268)
plugins/sixaxis.c:setup_leds() number 2
sixaxis: failed to set LEDS (0 bytes written)
src/agent.c:agent_ref() 0x8117eb8: ref=3
Program received signal SIGSEGV, Segmentation fault.

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