How would you get an incorrect checksum in the log anyway?

Checksums are on database pages in the data file.

There are instances of log corruption, that's not one of them.

Absolutely do not detach and delete the log. Unless you want to convert corrupt and online database into database that won't attach.

Take a look at this article. http://www.sqlservercentral.com/articles/65804/ and see the list of Do Nots.