Or the same patch from your github, http://gist.github.com/525921 which gives us the raw patch that can be applied directly, http://gist.github.com/raw/525921/fe2ad7583f0dd2444caa0b3e24d750bf45cac11b/Quick%20fix%20block%2074652
EDIT: I was unable to patch directly using this, perhaps CRLF problems.
I applied your changes manually, and uploaded the result here: http://yyz.us/bitcoin/patch.bitcoin-gavin-overflow-quick-fix