Forgot "git rebase --continue" and did "git commit". How to fix?

Just do git reset --soft HEAD^. It moves the HEAD pointer to its parent but keeps the work tree and adds the merge change to the index. So you can continue rebasing with git rebase --continue as before.

EDIT: Look at the answer below as well to see if that's an easier solution for you. https://stackoverflow.com/a/12163247/493106

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I'd have to try it out, but I think this is what I would do:

1. Tag your latest commit (or just write down its SHA1 somewhere so you don't lose it): git tag temp
2. git rebase --abort
3. Do the rebase again. You'll have to resolve the merge again. :(
4. git rebase --continue
5. git cherry-pick temp

The problem with this is that your temp commit probably contains both the resolution of the merge, and the new code. So it could be tricky but I would try it and see if it works.