drm/mgag200: Fix framebuffer pitch calculation
drm/mgag200: Fix framebuffer pitch calculation

The framebuffer pitch calculation needs to be done differently for bpp == 24
- check xf86-video-mga for reference.

Signed-off-by: Egbert Eich <d0f3508a0b242623257f3971a925c8211f91345e@suse.de>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs