drm: Constify drm_proc_list[]

Constify drm_proc_list[] and related pointers.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: dri-devel@lists.freedesktop.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 2d94d74..af53320 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1022,7 +1022,7 @@
 struct drm_info_node {
 	struct list_head list;
 	struct drm_minor *minor;
-	struct drm_info_list *info_ent;
+	const struct drm_info_list *info_ent;
 	struct dentry *dent;
 };