Fix potential buffer overflow that could happen if more than 100 announce files

were specified when calling ParkAndAnnounce. This overflow is not exploitable remotely
and so there is no need for a security advisory.

(closes issue #12386)
Reported by: davidw



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@113507 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_parkandannounce.c

@@ -211,7 +211,7 @@ static int parkandannounce_exec(struct ast_channel *chan, void *data)
 	tpl_working = template;
 	tpl_current=strsep(&tpl_working, ":");
 
-	while(tpl_current && looptemp < sizeof(tmp)) {
+	while(tpl_current && looptemp < ARRAY_LEN(tmp)) {
 		tmp[looptemp]=tpl_current;
 		looptemp++;
 		tpl_current=strsep(&tpl_working,":");