Revert "drm: don't associate _DRM_DRIVER maps with a master"

This reverts commit 6c51d1cfa0a370b48a157163340190cf5fd2346b, which
apparently causes DRI initialization failures on Radeons.

Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Requested-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/gpu/drm/drm_bufs.c

@@ -371,8 +371,7 @@ static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 	list->user_token = list->hash.key << PAGE_SHIFT;
 	mutex_unlock(&dev->struct_mutex);
 
-	if (!(map->flags & _DRM_DRIVER))
-		list->master = dev->primary->master;
+	list->master = dev->primary->master;
 	*maplist = list;
 	return 0;
 	}