ALSA: seq: replace ternary operator with max()

Fix the following coccicheck warning:

sound/core/seq/seq_ports.c:142:12-14: WARNING opportunity for max()
Signed-off-by: Guo Zhengkui <guozhengkui@vivo.com>
Link: https://lore.kernel.org/r/20220517062518.123292-1-guozhengkui@vivo.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/seq/seq_ports.c

@@ -139,7 +139,7 @@ struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client,
 	port_subs_info_init(&new_port->c_dest);
 	snd_use_lock_use(&new_port->use_lock);
 
-	num = port >= 0 ? port : 0;
+	num = max(port, 0);
 	mutex_lock(&client->ports_mutex);
 	write_lock_irq(&client->ports_lock);
 	list_for_each_entry(p, &client->ports_list_head, list) {