HLS: 修复hls直播ts/m3u8文件更新导致mmap失效，触发bus error的bug

src/Record/HlsMaker.cpp

@@ -132,8 +132,10 @@ void HlsMaker::flushLastSegment(bool eof){
     _seg_dur_list.push_back(std::make_tuple(seg_dur, std::move(_last_file_name)));
     _last_file_name.clear();
     delOldSegment();
-    makeIndexFile(eof);
+    //先flush ts切片，否则可能存在ts文件未写入完毕就被访问的情况
     onFlushLastSegment(seg_dur);
+    //然后写m3u8文件
+    makeIndexFile(eof);
 }
 
 bool HlsMaker::isLive() {

src/Record/HlsMakerImp.cpp

@@ -125,10 +125,11 @@ void HlsMakerImp::onWriteHls(const char *data, size_t len) {
 }
 
 void HlsMakerImp::onFlushLastSegment(uint32_t duration_ms) {
+    //关闭并flush文件到磁盘
+    _file = nullptr;
+
     GET_CONFIG(bool, broadcastRecordTs, Hls::kBroadcastRecordTs);
     if (broadcastRecordTs) {
-        //关闭ts文件以便获取正确的文件大小
-        _file = nullptr;
         _info.time_len = duration_ms / 1000.0f;
         struct stat fileData;
         stat(_info.file_path.data(), &fileData);