Merge branch 'os/fetch-check-not-current-branch'

The way "git fetch" without "--update-head-ok" ensures that HEAD in
no worktree points at any ref being updated was too wasteful, which
has been optimized a bit.

* os/fetch-check-not-current-branch:
  fetch: limit shared symref check only for local branches

builtin/fetch.c

@@ -1440,6 +1440,7 @@ static void check_not_current_branch(struct ref *ref_map,
 	const struct worktree *wt;
 	for (; ref_map; ref_map = ref_map->next)
 		if (ref_map->peer_ref &&
+		    starts_with(ref_map->peer_ref->name, "refs/heads/") &&
 		    (wt = find_shared_symref(worktrees, "HEAD",
 					     ref_map->peer_ref->name)) &&
 		    !wt->is_bare)