fix "converting to non-pointer type 'pthread_t'" compiler warning

pthread_t is - at least on our platform - not a pointer type, but
basically an int
don't assign NULL but 0 to fix that warning

git-svn-id: file:///home/bas/coolstream_public_svn/THIRDPARTY/applications/neutrino-experimental@1440 e54a6e83-5905-42d5-8d5c-058d10e6a962


Origin commit data
------------------
Branch: ni/coolstream
Commit: e9fb741134
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2011-05-07 (Sat, 07 May 2011)



------------------
This commit was generated by Migit

lib/libdvbsub/dvbsub.cpp

@@ -174,7 +174,7 @@ int dvbsub_close()
 		pthread_mutex_unlock(&readerMutex);
 
 		pthread_join(threadReader, NULL);
-		threadReader = NULL;
+		threadReader = 0;
 	}
 	if(threadDvbsub) {
 		dvbsub_running = false;
@@ -184,7 +184,7 @@ int dvbsub_close()
 		pthread_mutex_unlock(&packetMutex);
 
 		pthread_join(threadDvbsub, NULL);
-		threadDvbsub = NULL;
+		threadDvbsub = 0;
 	}
 	printf("[dvb-sub] stopped\n");
 

lib/libtuxtxt/tuxtxt.cpp

@@ -1548,7 +1548,7 @@ void tuxtx_stop_subtitle()
 	reader_running = 0;
 	if(ttx_sub_thread)
 		pthread_join(ttx_sub_thread, NULL);
-	ttx_sub_thread = NULL;
+	ttx_sub_thread = 0;
 	sub_pid = sub_page = 0;
 	ttx_paused = 0;
 }