core: Fix crash when a duplicated record is found

core: Fix crash when a duplicated record is found

 Invalid read of size 8
    at 0x470101: update_bredr_services (device.c:2784)
    by 0x470591: browse_cb (device.c:2975)
    by 0x458B0E: search_completed_cb (sdp-client.c:186)
    by 0x47C154: sdp_process (sdp.c:4343)
    by 0x458954: search_process_cb (sdp-client.c:205)
    by 0x3F31A47A54: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.3400.2)
    by 0x3F31A47D87: ??? (in /usr/lib64/libglib-2.0.so.0.3400.2)
    by 0x3F31A48181: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.3400.2)
    by 0x40A265: main (main.c:595)
  Address 0x0 is not stack'd, malloc'd or (recently) free'd