Make sure we initialize attributes properly on thread (bug #1563)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2955 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_zap.c

@@ -6178,6 +6178,10 @@ static void *pri_dchannel(void *vpri)
 	int i;
 	pthread_t threadid;
 	pthread_attr_t attr;
+	
+	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+
 	gettimeofday(&lastidle, NULL);
 	if (!ast_strlen_zero(pri->idledial) && !ast_strlen_zero(pri->idleext)) {
 		/* Need to do idle dialing, check to be sure though */