glx: fix shared memory leak in X11
call XShmDetach to allow X server to free shared memory Fixes: bcd80be4 "drisw/glx: use XShm if possible" Signed-off-by:Ray Zhang <zhanglei002@gmail.com> Reviewed-by:
Dave Airlie <airlied@redhat.com> (cherry picked from commit b344e32c)