TypeHintSniff: fix return evaluation issues

[gmazzap]

Fixes #40

[sirbrillig]

Thanks for this work!

Restore a wrong-styled line in fixture to don't break tests

Yeah, some of the fixtures have weird formatting intentionally to make sure we can handle them correctly, just in case! 😄

[gmazzap]

Thanks for merging @sirbrillig! Any plan to release a new version with last changes?

[sirbrillig]

@gmazzap Yup! I'll do one today. I was just waiting 24 hours to see if there were any more issues. ;-)