fsnotify: make dnotify_fsnotify_ops const

Make this const as it is never modified.

Signed-off-by: Bhumika Goyal <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>

fs/notify/dnotify/dnotify.c

···
 	kmem_cache_free(dnotify_mark_cache, dn_mark);
 }
 
-static struct fsnotify_ops dnotify_fsnotify_ops = {
+static const struct fsnotify_ops dnotify_fsnotify_ops = {
 	.handle_event = dnotify_handle_event,
 	.free_mark = dnotify_free_mark,
 };