What follows is a small cleanup of gnumach's assignments. Patches are based on clang's "dead assignment" reports.
[PATCH 1/5] kern: comment unused variable [PATCH 2/5] kern (rbtree_insert_rebalance): rewrite node swap [PATCH 3/5] kern: eliminate unused assignment [PATCH 4/5] vm: remove duplicate assignment [PATCH 5/5] vm: remove unused assignment
