drm: missing drm_vm.c changes for consistent maps

This adds a missing change from CVS for consistent maps.
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/drm_vm.c

@@ -148,7 +148,8 @@ static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
 
 	offset	 = address - vma->vm_start;
 	i = (unsigned long)map->handle + offset;
-	page = vmalloc_to_page((void *)i);
+	page = (map->type == _DRM_CONSISTENT) ? 
+		virt_to_page((void *)i) : vmalloc_to_page((void *)i);
 	if (!page)
 		return NOPAGE_OOM;
 	get_page(page);