transport: use get_refs_via_connect to get refs

Remove code duplication and use the existing 'get_refs_via_connect()'
function to retrieve a remote's heads in 'fetch_refs_via_pack()' and
'git_transport_push()'.
Signed-off-by: NBrandon Williams <bmwill@google.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

transport.c

@@ -230,12 +230,8 @@ static int fetch_refs_via_pack(struct transport *transport,
 	args.cloning = transport->cloning;
 	args.update_shallow = data->options.update_shallow;
 
-	if (!data->got_remote_heads) {
-		connect_setup(transport, 0);
-		get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
-				 NULL, &data->shallow);
-		data->got_remote_heads = 1;
-	}
+	if (!data->got_remote_heads)
+		refs_tmp = get_refs_via_connect(transport, 0);
 
 	refs = fetch_pack(&args, data->fd, data->conn,
 			  refs_tmp ? refs_tmp : transport->remote_refs,
@@ -541,14 +537,8 @@ static int git_transport_push(struct transport *transport, struct ref *remote_re
 	struct send_pack_args args;
 	int ret;
 
-	if (!data->got_remote_heads) {
-		struct ref *tmp_refs;
-		connect_setup(transport, 1);
-
-		get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
-				 NULL, &data->shallow);
-		data->got_remote_heads = 1;
-	}
+	if (!data->got_remote_heads)
+		get_refs_via_connect(transport, 1);
 
 	memset(&args, 0, sizeof(args));
 	args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);