Fix warnings in Star Wars example
Fix warnings in Star Wars example

Summary: Closes https://github.com/facebook/relay/pull/960

Differential Revision: D3063173

Pulled By: kassens

fb-gh-sync-id: f0d55746747448afc2f30bb9f44431666ff123cb
shipit-source-id: f0d55746747448afc2f30bb9f44431666ff123cb

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