fix hls error when stream has extension.

for issues/4215

trunk/src/app/srs_app_http_stream.cpp

@@ -629,7 +629,7 @@ srs_error_t SrsLiveStream::serve_http(ISrsHttpResponseWriter* w, ISrsHttpMessage
 
     // Correct the app and stream by path, which is created from template.
     // @remark Be careful that the stream has extension now, might cause identify fail.
-    req->stream = srs_path_basename(r->path());
+    req->stream = srs_path_filename(r->path());
 
     // update client ip
     req->ip = hc->remote_ip();