serve: use repository pointer to get config

A few of the v2 "serve" callbacks ignore their repository parameter and
read config using the_repository (either directly or implicitly by
calling wrapper functions). This isn't a bug since the server code only
handles a single main repository anyway (and indeed, if you look at the
callers, these repository parameters will always be the_repository). But
in the long run we want to get rid of the_repository, so let's take a
tiny step in that direction.

As a bonus, this silences some -Wunused-parameter warnings.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

bundle-uri.c

@@ -884,7 +884,7 @@ int bundle_uri_command(struct repository *r,
 	 * Read all "bundle.*" config lines to the client as key=value
 	 * packet lines.
 	 */
-	git_config(config_to_packet_line, &writer);
+	repo_config(r, config_to_packet_line, &writer);
 
 	packet_writer_flush(&writer);