Merge branch 'jc/transport-do-not-use-connect-twice-in-fetch' into maint

The auto-tag-following code in "git fetch" tries to reuse the same transport twice when the serving end does not cooperate and does not give tags that point to commits that are asked for as part of the primary transfer. Unfortunately, Git-aware transport helper interface is not designed to be used more than once, hence this does not work over smart-http transfer. * jc/transport-do-not-use-connect-twice-in-fetch: builtin/fetch.c: Fix a sparse warning fetch: work around "transport-take-over" hack fetch: refactor code that fetches leftover tags fetch: refactor code that prepares a transport fetch: rename file-scope global "transport" to "gtransport" t5802: add test for connect helper