tag: add repository argument to deref_tag

Add a repository argument to allow the callers of deref_tag
to be more specific about which repository to act on. This is a small
mechanical change; it doesn't change the implementation to handle
repositories other than the_repository yet.

As with the previous commits, use a macro to catch callers passing a
repository other than the_repository at compile time.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/http-push.c b/http-push.c
index f7b70c4..5eaf551 100644
--- a/http-push.c
+++ b/http-push.c
@@ -1477,7 +1477,7 @@ static void add_remote_info_ref(struct remote_ls_ctx *ls)
 		    oid_to_hex(&ref->old_oid), ls->dentry_name);
 
 	if (o->type == OBJ_TAG) {
-		o = deref_tag(o, ls->dentry_name, 0);
+		o = deref_tag(the_repository, o, ls->dentry_name, 0);
 		if (o)
 			strbuf_addf(buf, "%s\t%s^{}\n",
 				    oid_to_hex(&o->oid), ls->dentry_name);