[Bug c/55976] -Werror=return-type should error on returning a value from a void function

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55976

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Dave Pagan from comment #6)
> Helpful update, Jonathan - did you want to follow up on this bug then? Or
> should I go ahead based on your new information?

I missed this reply, sorry. I wasn't going to do anything further so thanks for
working on it.