Move setting hostname to end of method body in order to actually return it

[nuchi-airbnb]

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What does this PR do?

Moves the line setting @@hostname to the end of the method body.

I'd noticed that our logs included hostname "n/a". The change I made fixes it. I'm not sure why your tests don't reproduce it; I notice you already have a test for this method.

Description of the Change

See above. It's short enough that I hope an extended discussion is unnecessary.

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[zippolyte]

Thanks for this contribution !