Merge branch 'jt/promisor-remote-fetch-tweak'

Remove error detection from a function that fetches from promisor
remotes, and make it die when such a fetch fails to bring all the
requested objects, to give an early failure to various operations.

* jt/promisor-remote-fetch-tweak:
  promisor-remote: die upon failing fetch
  promisor-remote: remove a return value

diff --cc object-file.c
Simple merge