fix a typo

[martinlindhe]

Sorry about the PR, just noticed your patch policy.

If someone with repository access could just commit this one

[crobinso]

Thanks for the patch, but qemu doesn't commit patches directly to the repo unless it's a build fix, everything needs to go through a pull request. If you'd like this fix included please send it to qemu-trivial: https://wiki.qemu.org/Contribute/TrivialPatches

In the meantime please close this pull request

[repo-lockdown]

Thank you for your interest in the QEMU project.

This repository is a read-only mirror of the project's master
repostories hosted on https://git.qemu.org/git/qemu.git.
The project does not process merge requests filed on GitHub.

QEMU welcomes contributions of code (either fixing bugs or adding new
functionality). However, we get a lot of patches, and so we have some
guidelines about contributing on the project website:
https://www.qemu.org/contribute/