Fix crash in ParkAndAnnounce.

Well, thats embarrasing.  I forgot to initialize the caller_id storage.

(closes issue ASTERISK-19311)
Reported by: tootai
Tested by: rmudgett


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@354495 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_parkandannounce.c

@@ -140,6 +140,7 @@ static int parkandannounce_exec(struct ast_channel *chan, const char *data)
 	}
 
 	/* Save the CallerID because the masquerade turns chan into a ZOMBIE. */
+	ast_party_id_init(&caller_id);
 	ast_channel_lock(chan);
 	ast_party_id_copy(&caller_id, &chan->caller.id);
 	ast_channel_unlock(chan);