properly shutdown IGMP timeout handler thread when the plugin is stopped.

Fixes occasional segfaults on VDR exit.

HISTORY

@@ -1,6 +1,8 @@
 VDR Plugin 'streamdev' Revision History
 ---------------------------------------
  
+- properly shutdown IGMP timeout handler thread when the plugin is stopped.
+  Fixes occasional segfaults on VDR exit.
 - fixed memory leak in libdvbmpeg read_pes (thanks to Ville Skyttä)
 - dropped several unused functions in libdvbmpeg
 - restricted VTP command RENR to liemikuutio patch < 1.32. Build fails with

server/componentIGMP.c

@@ -144,7 +144,9 @@ void cComponentIGMP::Destruct(void)
 {
 	if (m_MaxChannelNumber > 0)
 	{
-		Cancel(3);
+		Cancel(-1);
+		m_CondWait.Signal();
+		Cancel(2);
 		for (cChannel *channel = Channels.First(); channel; channel = Channels.Next(channel))
 		{
 			if (channel->GroupSep())