Merge branch 'kk/fetch-store-ref-optimization' into seen

When fetching from a transport that provides a self-contained pack,
pass the transport pointer to the post-fetch `check_connected()` call
to optimize connectivity check.

Retracted.
cf. <CAL71e4MrVqC1=AR6x0_8S=8kVqPdDkhgCZRb4etFsxTzd6s_8Q@mail.gmail.com>

* kk/fetch-store-ref-optimization:
  fetch: pass transport to post-fetch connectivity check

diff --cc builtin/fetch.c
Simple merge