eitd/sectionsd.cpp: fix busywait loop after service stop

Origin commit data
------------------
Commit: c4a8d40853
Author: [CST] Focus <focus.cst@gmail.com>
Date: 2014-12-05 (Fri, 05 Dec 2014)

src/eitd/sectionsd.cpp

@@ -980,6 +980,7 @@ static void commandserviceStopped(int connfd, char * /* data */, const unsigned
 	threadCN.unlock();
 	threadEIT.unlock();
 	threadCN.stopUpdate();
+	current_channel_id = 0;
 	xprintf("[sectionsd] commandserviceStopped done\n");
 }