[PATCH:xserver] modesetting should not reference gbm when it's not defined

[Adam Jackson]

On Fri, 2016-01-01 at 18:10 -0800, Alan Coopersmith wrote:
> Fixes build errors of:
> present.c: In function 'ms_do_pageflip':
> present.c:410:17: error: 'drmmode_bo' has no member named 'gbm'
>      new_front_bo.gbm = glamor_gbm_bo_from_pixmap(screen, new_front);
>                  ^
> present.c:412:22: error: 'drmmode_bo' has no member named 'gbm'
>      if (!new_front_bo.gbm) {
>                       ^
> present.c: In function 'ms_present_check_flip':
> present.c:536:36: error: 'drmmode_bo' has no member named 'gbm'
>          if (drmmode_crtc->rotate_bo.gbm)
>                                     ^
> Introduced by commit 13c7d53d
> 
> Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

remote: Updating patchwork state for http://patchwork.freedesktop.org/project/Xorg/list/
remote: I: patch #69311 updated using rev fe8562f5316d8c74ca074ad145295c65ddff5fc2.
remote: I: 1 patch(es) updated to state Accepted.
To ssh://git.freedesktop.org/git/xorg/xserver
   7921764..fe8562f  master -> master

- ajax