add record_min_sec chan var

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15272 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_ivr_async.c

@@ -1018,7 +1018,7 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_record_session(switch_core_session_t
 	
 	if ((p = switch_channel_get_variable(channel, "RECORD_MIN_SEC"))) {
 		int tmp = atoi(p);
-		if (tmp > 0) {
+		if (tmp >= 0) {
 			rh->min_sec = tmp;
 		}
 	}