jack_free() should be used to free memory returned by jack_get_ports()

http://jackaudio.org/files/docs/html/jack_8h.html#a437010097629ac8124a56c752c02f299

example-clients/simple_client.c

@@ -191,7 +191,7 @@ main (int argc, char *argv[])
 		fprintf (stderr, "cannot connect output ports\n");
 	}
 
-	free (ports);
+	jack_free (ports);
     
     /* install a signal handler to properly quits jack client */
 #ifdef WIN32