Merge branch 'jk/strip-suffix'

* jk/strip-suffix: prepare_packed_git_one: refactor duplicate-pack check verify-pack: use strbuf_strip_suffix strbuf: implement strbuf_strip_suffix index-pack: use strip_suffix to avoid magic numbers use strip_suffix instead of ends_with in simple cases replace has_extension with ends_with implement ends_with via strip_suffix add strip_suffix function sha1_file: replace PATH_MAX buffer with strbuf in prepare_packed_git_one()