Fix unused variable warning
Fix unused variable warning

I considered removing the parameter entirely, but we'll want to go the
more overengineered, factory/builder-festooned route eventually, once
we start doing transient adjoint sensitivities.

nicholasmalaya/grins,cahaynes/grins,vikramvgarg/grins,cahaynes/grins,nicholasmalaya/grins,nicholasmalaya/grins,cahaynes/grins,cahaynes/grins,vikramvgarg/grins,cahaynes/grins,vikramvgarg/grins,vikramvgarg/grins,cahaynes/grins,vikramvgarg/grins,nicholasmalaya/grins,vikramvgarg/grins