A police report for the purpose of a PR application is actually valid for twelve months, however due to the delay from AVO, that is why they have to redo them again.
For your spouse, as long as he has not gone back to Ghana, after the initial police report was done, the police report is still valid.
Do not fret, you can add a letter of explanation and merge it with the previous police report if asked, but that's the rule, and you would not get penalized.
Also, remember that you might be asked to fill a new travel history form, so that sorts it out.
Do not fret, all will be well