android/avrcp: Fix crash while discovering records
android/avrcp: Fix crash while discovering records

If the device is removed before SDP discovery is completed the following
crash can happen:

Invalid read of size 4
    at 0x11CA6A: avrcp_device_free (avrcp.c:472)
    by 0x11D70F: search_cb (avrcp.c:944)
    by 0x13749D: search_completed_cb (sdp-client.c:176)
    by 0x134E0F: sdp_process (sdp.c:4345)
    by 0x1374F5: search_process_cb (sdp-client.c:201)
    by 0x48BD9C7: g_io_unix_dispatch (giounix.c:166)
    by 0x48C2CCB: g_main_context_dispatch (gmain.c:2539)
    by 0x48C2ED9: g_main_context_iterate.isra.19 (gmain.c:3146)
    by 0x48C3167: g_main_loop_run (gmain.c:3340)
    by 0x10D00D: main (main.c:538)
Address 0x4bcb904 is 20 bytes inside a block of size 24 free'd
    at 0x4897E6C: free (in /system/lib/valgrind/vgpreload_memcheck-arm-linux.so)
    by 0x48C5E2B: g_free (gmem.c:252)
    by 0x11A52F: bt_a2dp_notify_state (a2dp.c:238)
    by 0x1172C1: process_disconnect (avdtp.c:1005)
    by 0x48C146B: g_list_foreach (gslist.c:840)
    by 0x48CD869: g_slist_free_full (gslist.c:177)
    by 0x117CAB: connection_lost (avdtp.c:1021)
    by 0x11A02F: session_cb (avdtp.c:2081)
    by 0x48BD9C7: g_io_unix_dispatch (giounix.c:166)
    by 0x48C2CCB: g_main_context_dispatch (gmain.c:2539)
    by 0x48C2ED9: g_main_context_iterate.isra.19 (gmain.c:3146)
    by 0x48C3167: g_main_loop_run (gmain.c:3340)

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