fix the hls_dispose bug, ignore for 0.

@@ -950,6 +950,8 @@ int SrsHlsCache::on_publish(SrsHlsMuxer* muxer, SrsRequest* req, int64_t segment
     double hls_aof_ratio = _srs_config->get_hls_aof_ratio(vhost);
     // whether use floor(timestamp/hls_fragment) for variable timestamp
     bool ts_floor = _srs_config->get_hls_ts_floor(vhost);
+    // the seconds to dispose the hls.
+    int hls_dispose = _srs_config->get_hls_dispose(vhost);
     
     // TODO: FIXME: support load exists m3u8, to continue publish stream.
     // for the HLS donot requires the EXT-X-MEDIA-SEQUENCE be monotonically increase.
@@ -967,9 +969,9 @@ int SrsHlsCache::on_publish(SrsHlsMuxer* muxer, SrsRequest* req, int64_t segment
         srs_error("m3u8 muxer open segment failed. ret=%d", ret);
         return ret;
     }
-    srs_trace("hls: win=%.2f, frag=%.2f, prefix=%s, path=%s, m3u8=%s, ts=%s, aof=%.2f, floor=%d, clean=%d, waitk=%d",
+    srs_trace("hls: win=%.2f, frag=%.2f, prefix=%s, path=%s, m3u8=%s, ts=%s, aof=%.2f, floor=%d, clean=%d, waitk=%d, dispose=%d",
         hls_window, hls_fragment, entry_prefix.c_str(), path.c_str(), m3u8_file.c_str(),
-        ts_file.c_str(), hls_aof_ratio, ts_floor, cleanup, wait_keyframe);
+        ts_file.c_str(), hls_aof_ratio, ts_floor, cleanup, wait_keyframe, hls_dispose);
     
     return ret;
 }
@@ -1188,6 +1190,9 @@ int SrsHls::cycle()
     }
     
     int hls_dispose = _srs_config->get_hls_dispose(_req->vhost) * 1000;
+    if (hls_dispose <= 0) {
+        return ret;
+    }
     if (srs_get_system_time_ms() - last_update_time <= hls_dispose) {
         return ret;
     }