Fix vidupdate for chan_zap to eliminate sillyl warning

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6505 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_zap.c

@@ -4777,6 +4777,9 @@ static int zt_indicate(struct ast_channel *chan, int condition)
 			} else
 				res = 0;
 			break;
+		case AST_CONTROL_VIDUPDATE:
+			res = 0;
+			break;
 		case -1:
 			res = tone_zone_play_tone(p->subs[index].zfd, -1);
 			break;