vfs: fix typo in comment in recent dentry work

Sedat points out that I transposed some letters in "LRU" and wrote "RLU"
instead in one of the new comments explaining the flow.  Let's just fix
it.
Reported-by: Sedat Dilek <sedat.dilek@jpberlin.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/dcache.c

@@ -1435,7 +1435,7 @@ static enum d_walk_ret select_collect(void *_data, struct dentry *dentry)
 		/*
 		 * We can't use d_lru_shrink_move() because we
 		 * need to get the global LRU lock and do the
-		 * RLU accounting.
+		 * LRU accounting.
 		 */
 		d_lru_del(dentry);
 		d_shrink_add(dentry, &data->dispose);