genrecog: Address -Wsign-compare diagnostics

[Richard Sandiford]

Thomas Schwinge <thomas@codesourcery.com> writes:
> Hi!
>
> On Mon, 27 Apr 2015 11:20:30 +0100, Richard Sandiford
> <richard.sandiford@arm.com> wrote:
>> This patch [...] by replacing most of genrecog [...]
>
> OK to commit?

Looks good to me FWIW.  Probably counts as obvious.

Thanks,
Richard