[fortran,patch] Fix PR35937, give function result string length the right type

[FX]

ping


> Attached patch fixes one corner-case where we used to give a wrong
> type to a character function result length. I'd appreciate if someone
> who understands the mapping functions in trans-expr.c could review
> this one to tell me if this is the fix looks right or if there is a
> better, more specific way of handling that issue.
>
> Boostrapped and regtested on x86_64-linux, comes with a testcase from
> the PR. OK to commit?
>
> FX
>
> -- 
> FX Coudert
> http://www.homepages.ucl.ac.uk/~uccafco/
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