Deleting nodes is strongly discouraged. However, if you like, you can edit your post, using <strike> tags and marking updates as such to correct it - see "How do I change/delete my post?" for more good information on this. You could explain what the problem was and how it was fixed, that would maximize what others can learn from your post.

Mistakes happen, don't worry about it! Acknowledging them and fixing them is much more honorable and productive than trying to hide or defend them :-)