Merge branch 'rs/multi-filter-args'

Fix a bug where `pack-objects` would not respect multiple `--filter` arguments when invoked directly. * rs/multi-filter-args: list-objects-filter: remove OPT_PARSE_LIST_OBJECTS_FILTER_INIT() pack-objects: simplify --filter handling pack-objects: fix handling of multiple --filter options t5317: demonstrate failure to handle multiple --filter options t5317: stop losing return codes of git ls-files