On shutdown xserver was closing connections that were already closed, resulting
in a segfault.
(From OE-Core rev: 04ffd02a14f5e0cd2ce0288b589d4c4a0120e2f4)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>