info: Fix style: Use a guard clause

[sjackman]

Fix the style error:

Library/Homebrew/cmd/info.rb:88:7: C:
Use a guard clause instead of wrapping the code inside a conditional expression.

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

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See the Docker Hub build failure at https://cloud.docker.com/u/linuxbrew/repository/registry-1.docker.io/linuxbrew/brew/hub-builddetail/b65dbhtpfk5ywqqvfz5aeqh

[MikeMcQuaid]

Makes sense. Weird that this didn't fail our CI. Any ideas why @sjackman; what's different on Docker Hub? I'd also argue if our CI is green then Docker Hub's should be too.

[sjackman]

Any ideas why @sjackman; what's different on Docker Hub?

No idea, sorry. My best guess would be a different version of rubocop somehow?

I'd also argue if our CI is green then Docker Hub's should be too.

Yes, I agree. I just don't have the time right now to dig into it. Thanks for merging though.