Fix V23 callerid handling if an event is received (bug #2909)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4296 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_zap.c

@@ -5315,6 +5315,7 @@ static void *ss_thread(void *data)
 							res = zt_get_event(p->subs[index].zfd);
 							ast_log(LOG_NOTICE, "Got event %d (%s)...\n", res, event2str(res));
 							res = 0;
+							break;
 						} else if (i & ZT_IOMUX_READ) {
 							res = read(p->subs[index].zfd, buf, sizeof(buf));
 							if (res < 0) {