modesetting: fix stride if kernel modifies it.
modesetting: fix stride if kernel modifies it.

If the kernel aligns things use its values instead.

fixes output on nouveau here.

Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

patjak/xf86-video-gma500,wzyy2/xf86-video-modesetting,patjak/xf86-video-gma500,wzyy2/xf86-video-modesetting