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[PATCH 0/7] some fetch reachability-error fixes

This series fixes a few minor bugs around clients trying to fetch
unreachable commits, along with a few associated cleanups.

There's a minor conflict in t5516 when merging with next, since that
adds GIT_TEST_PROTOCOL_VERSION, causing a few textual conflicts. The
resolution should be fairly clear.

Where appropriate, I took GIT_TEST_PROTOCOL_VERSION into account so that
after merging with next, all tests should still pass even with it set to
"2" (well, all the tests that do not already fail on vanilla 'next' with
that setting).

  [1/7]: t5516: drop ok=sigpipe from unreachable-want tests
  [2/7]: t5530: check protocol response for "not our ref"
  [3/7]: upload-pack: send ERR packet for non-tip objects
  [4/7]: pkt-line: prepare buffer before handling ERR packets
  [5/7]: fetch: use free_refs()
  [6/7]: remote.c: make singular free_ref() public
  [7/7]: fetch: do not consider peeled tags as advertised tips

 fetch-pack.c                 | 16 +++++++++-------
 pkt-line.c                   |  9 +++++----
 remote.c                     |  6 +++---
 remote.h                     |  4 +++-
 t/t5516-fetch-push.sh        | 18 +++++++++++++++---
 t/t5530-upload-pack-error.sh | 18 +++++++++++++++---
 upload-pack.c                | 11 ++++++++---
 7 files changed, 58 insertions(+), 24 deletions(-)