Merge branch 'jk/fetch-pack-fsck-wo-lock-pack' into maint-2.45

"git fetch-pack -k -k" without passing "--lock-pack" (which we never do ourselves) did not work at all, which has been corrected. * jk/fetch-pack-fsck-wo-lock-pack: fetch-pack: fix segfault when fscking without --lock-pack