streamts: speed up shutdown

Origin commit data
------------------
Commit: ef4d9e95df
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2012-02-12 (Sun, 12 Feb 2012)

src/driver/streamts.cpp

@@ -247,6 +247,7 @@ void streamts_main_thread(void * /*data*/)
 	if(st != 0) {
 		printf("Stopping stream thread\n");
 		exit_flag = 1;
+		pthread_cancel(st);
 		pthread_join(st, NULL);
 		close(connfd);
 	}