fix minor memory leak on failed shoutcast source auth

svn path=/icecast/trunk/icecast/; revision=14044

src/connection.c

@@ -1214,6 +1214,7 @@ static void _handle_shoutcast_compatible (client_queue_t *node)
         else
             INFO1 ("password does not match \"%s\"", client->refbuf->data);
         client_destroy (client);
+        free (source_password);
         free (node);
         return;
     }