lint: Enable always_declare_return_types; fix existing places they're missing #851
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When the return type is omitted, the syntax for a function declaration looks a lot like that for a function call.
Some of these also get clearer because the type is nontrivial and a typedef for it is helpful for describing another function's signature too.
Prompted by
#813 (comment)
and previously
#790 (comment)
… and previously several other occasions, going back to:
#305 (comment)