Merge branch 'rs/checkout-some-states-are-const'

Code cleanup. * rs/checkout-some-states-are-const: checkout: constify parameters of checkout_stage() and checkout_merged()

Junio C Hamano committed Sep 21, 2016 at 15:15 UTC 48e1f8ed017295b1ba5e2e26752842a50f5e35cd

No changes.