File locking bugfix for v4.21

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Merge tag 'locks-v4.21-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux

Pull file locking bugfix from Jeff Layton:
 "This is a one-line fix for a bug that syzbot turned up in the new
  patches to mitigate the thundering herd when a lock is released"

* tag 'locks-v4.21-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux:
  locks: fix error in locks_move_blocks()

fs/locks.c

@@ -453,7 +453,7 @@ static void locks_move_blocks(struct file_lock *new, struct file_lock *fl)
 		return;
 	spin_lock(&blocked_lock_lock);
 	list_splice_init(&fl->fl_blocked_requests, &new->fl_blocked_requests);
-	list_for_each_entry(f, &fl->fl_blocked_requests, fl_blocked_member)
+	list_for_each_entry(f, &new->fl_blocked_requests, fl_blocked_member)
 		f->fl_blocker = new;
 	spin_unlock(&blocked_lock_lock);
 }