Merge branch 'ps/abbrev-length-before-setup-fix'

Setting core.abbrev too early before the repository set-up (typically in "git clone") caused segfault, which as been corrected. * ps/abbrev-length-before-setup-fix: object-name: don't try to abbreviate to lengths greater than hexsz parse-options-cb: stop clamping "--abbrev=" to hash length config: fix segfault when parsing "core.abbrev" without repo