CLN: Remove unused vars in roll_window
lgtm - nice catch! Is there any way to auto-detect this in Cython? Vaguely recall trying but there being some linting limitation @jbrockmendel  We're not going to get flake8 working on the cython files anytime soon, so maybe we can get gcc/clang/whatever to issue a warning about declared-but-unused variables? thanks @ihsansecer 